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Number: 4 |
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| Facts about the number: 4 is the number of bits in a nibble, equivalent to half a byte. 4 is the number of completed, numbered symphonies by Johannes Brahms. 4 is the number of movements in a symphony. 4 is the number of nucleobase types in DNA and RNA – adenine, guanine, cytosine, thymine (uracil in RNA). 4 is the number of characters in a canonical four-character idiom in Chinese. 4 is the number of strings on a violin, a viola, a cello, double bass, a cuatro and a ukulele, and the number of string pairs on a mandolin. 4 is the number of chambers the mammalian heart consists of. 4 is the smallest composite number, its proper divisors being 1 and 2. 4 is the second square number, the second centered triangular number. 4 is the smallest composite number that is equal to the sum of its prime factors. 4 is an all-Harshad number and a semi-meandric number. 4 is also a Motzkin number. 4 is the first positive non-Fibonacci number. 4 is the maximum number of dimensions of a real division algebra (the quaternions), by a theorem of Ferdinand Georg Frobenius. 4 is the smallest number of colors sufficient to color all planar maps. |
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| The number of digits in the number: \( n \): \( d = \lfloor \log_{10}(n) \rfloor + 1 \) |
1 | |
| Sum of the digits: \( n \): \( S = \sum_{i=1}^{k} d_i \) |
4 | |
| Reverse number: \( \text{Reverse}(n) = \sum_{i=1}^{k} d_i \cdot 10^{k-i} \) |
0.25 | |
| Binary number system: \( n = \sum_{i=0}^{k-1} d_i \cdot 2^i \) |
1000110000010001010010110011010010001111001101 | |
| Hexadecimal number system: \( n = \sum_{i=0}^{k-1} d_i \cdot 16^i \) |
230452cd23cd | |
| Parity of the number: \( \text{Parity}(n) = n \mod 2 \) |
even | |
| Simplicity of the number: \(\text{IsPrime}(n) = n > 1 \land \forall d \in [2, \sqrt{n}], n \mod d \neq 0\) |
false | |
| The square root: \(\sqrt{n} = n^{\frac{1}{2}}\) |
2 | |
| The factorial of the number: \( n!=n \times (n-1) \times (n-2) \times \ldots \times 2 \times 1 \) |
24 | |
| The sign of the number: \(\text{sign}(n) = \begin{cases} 1, & \text{if } n>0 \ 0, & \text{if } n=0 \ -1, & \text{if } n<0 \end{cases}\) |
+ | |
| The nearest multiple of 10: \(\text{10}(n) = 10 \times \left\lfloor \frac{n + 5}{10} \right\rfloor\) |
0 | |
| The nearest multiple of 100: \(\text{100}(n) = 100 \times \left\lfloor \frac{n + 50}{100} \right\rfloor\) |
0 | |
| Sine: \(\sin(x) = \sum_{n=0}^{\infty} \frac{(-1)^n x^{2n+1}}{(2n+1)!}\) |
-0.75680249530793 | |
| Cosine: \(\cos(x) = \sum_{n=0}^{\infty} \frac{(-1)^n x^{2n}}{(2n)!}\) |
-0.65364362086361 | |
| Tangent: \(\tan(x) = \sum_{n=0}^{\infty} \frac{(-1)^n 2^{2n} (2^{2n} - 1) B_{2n} x^{2n-1}}{(2n)!}\) |
1.1578212823496 | |
| The square of the number: \(\text{square}(n) = n^2\) |
16 | |
| Cubic root: \(\text{}(n) = \sqrt[3]{n}\) |
1.5874010519682 | |
| Natural logarithm: \(\ln(ab) = \ln(a) + \ln(b)\) |
1.3862943611199 | |
| Common logarithm: \(\log_{10}(ab) = \log_{10}(a) + \log_{10}(b)\) |
0.60205999132796 | |
| All divisors of a number: \( D(n) = \{ d \in \mathbb{Z}^+ : n \mod d = 0 \} \) |
1, 2, 4 | |
| Base64: | My44NTAxNDc2MDE3MTAx | |
| SHA1: | 400bb76fb0681461ff262fafb127c19b76d92883 | |
| MD5: | 88ea8dce0abdb080b9f7882148f4bc36 | |
| Converts a number to a Roman representation: | IV | |
| Converting the number of seconds to days, hours, minutes and seconds: | days: 0, hours: 0, minutes: 0, seconds: 4. | |
| Converts a number to a date in UNIX time format: | ||
| Chinese: | 1970 月 1 星期四 | |
| Spanish: | 1970 Enero 1 Jueves | |
| English: | 1970 January 1 Thursday | |
| Hindi: | 1970 जनवरी 1 गुरुवार | |
| Arab: | 1970 يناير 1 الخميس | |
| Bengal: | 1970 জানুয়ারী 1 বৃহস্পতিবার | |
| Portuguese: | 1970 Janeiro 1 Quinta-feira | |
| Russian: | 1970 Январь 1 Четверг | |
| Japanese: | 1970 一月 1 木曜日 | |
| Lahnda: | 1970 جنوری 1 جمعرات | |
| Marathi: | 1970 जानेवारी 1 गुरुवार | |
| Telugu: | 1970 జనవరి 1 గురువారం | |
| Malay: | 1970 Januari 1 Khamis | |
| Turkish: | 1970 Ocak 1 Perşembe | |
| Korean: | 1970 1월 1 목요일 | |
| French: | 1970 Janvier 1 Jeudi | |
| German: | 1970 Januar 1 Donnerstag | |
| Vietnamese: | 1970 Tháng Một 1 Thứ năm | |
| Tamil: | 1970 ஜனவரி 1 வியாழக்கிழமை | |
| Urdu: | 1970 جنوری 1 جمعرات | |
| Javanese: | 1970 Januari 1 Kemis | |
| Italian: | 1970 Gennaio 1 Giovedì | |
| Persian: | 1970 ژانویه 1 پنجشنبه | |
| Gujaratis: | 1970 જાન્યુઆરી 1 ગુરુવાર | |
| Length: | ||
| 4 kilometers = 4,000.00 meters | ||
| 4 miles = 6,437.36 meters | ||
| 4 feet = 1.22 meters | ||
| 4 inches = 0.10 meters | ||
| 4 yards = 3.66 meters | ||
| 4 meters = 0.00 kilometers | ||
| 4 meters = 0.00 miles | ||
| 4 meters = 13.12 feet | ||
| 4 meters = 157.48 inches | ||
| 4 meters = 4.37 yards | ||
| Weight: | ||
| 4 pounds = 1.81 kilograms | ||
| 4 grams = 0.00 kilograms | ||
| 4 ounces = 0.11 kilograms | ||
| 4 tons = 3,628.74 kilograms | ||
| 4 kilograms = 8.82 pounds | ||
| 4 kilograms = 4,000.00 grams | ||
| 4 kilograms = 141.10 ounces | ||
| 4 kilograms = 0.00 tons | ||
| Volume: | ||
| 4 gallons = 15.14 liters | ||
| 4 milliliters = 0.00 liters | ||
| 4 cubic meters = 4,000.00 liters | ||
| 4 liters = 1.06 gallons | ||
| 4 liters = 4,000.00 milliliters | ||
| 4 liters = 0.00 cubic meters | ||
| Area: | ||
| 4 acres = 16,187.44 square meters | ||
| 4 hectares = 40,000.00 square meters | ||
| 4 square feet = 0.37 square meters | ||
| 4 square inches = 0.00 square meters | ||
| 4 square meters = 0.00 acres | ||
| 4 square meters = 0.00 hectares | ||
| 4 square meters = 43.06 square feet | ||
| 4 square meters = 6,200.01 square inches | ||
| Temperature: | ||
| 4 celsius = 39.20 fahrenheit | ||
| 4 celsius = 277.15 kelvin | ||
| 4 fahrenheit = -15.56 celsius | ||
| 4 fahrenheit = 257.59 kelvin | ||
| 4 kelvin = -269.15 celsius | ||
| 4 kelvin = -452.47 fahrenheit | ||
| Time: | ||
| 4 seconds = 0.07 minutes | ||
| 4 seconds = 0.00 hours | ||
| 4 seconds = 0.00 days | ||
| 4 minutes = 240.00 seconds | ||
| 4 minutes = 0.07 hours | ||
| 4 minutes = 0.00 days | ||
| 4 hours = 14,400.00 seconds | ||
| 4 hours = 240.00 minutes | ||
| 4 hours = 0.17 days | ||
| 4 days = 345,600.00 seconds | ||
| 4 days = 5,760.00 minutes | ||
| 4 days = 96.00 hours | ||
| Energy: | ||
| 4 joules = 0.96 calories | ||
| 4 joules = 0.00 kilojoules | ||
| 4 joules = 0.00 watt hours | ||
| 4 calories = 16.74 joules | ||
| 4 calories = 0.02 kilojoules | ||
| 4 kilojoules = 4,000.00 joules | ||
| 4 kilojoules = 956.02 calories | ||
| 4 watt hours = 14,400.00 joules | ||
| 4 watt hours = 14.40 kilojoules | ||
| Information: | ||
| 4 bytes = 0.00 kilobytes | ||
| 4 kilobytes = 4,096.00 bytes | ||
| 4 kilobytes = 0.00 megabytes | ||
| 4 megabytes = 4,096.00 kilobytes | ||
| 4 megabytes = 0.00 gigabytes | ||
| 4 gigabytes = 4,096.00 megabytes | ||
| 4 gigabytes = 0.00 terabytes | ||
| 4 terabytes = 4,096.00 gigabytes | ||