The number 11979
11979 is a composite number with 12 divisors. Its prime factorisation is × . Divisors (12): 1, 3, 9, 11, 33, 99, 121, 363, 1089, 1331, 3993, 11979.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
11979 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
11979 is composite. Its prime factorisation is
- 3
The divisors add up to 19032; without 11979 itself that is 7053, so 11979 is deficient (7053 is less than 11979). Euler's totient φ(11979) = 7260 numbers up to 11979 share no factor with it.
- 4
The digits of 11979 add up to 27, and repeating that until one digit is left gives the digital root 9. The Collatz sequence (halve if even, else 3n+1) takes 187 steps to reach 1.
LaTeX source of the formulas on this page
\[ 11979 = 3^{2} \times 11^{3} \]11979 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 12 |
| Sum of divisors | 19032 |
| Euler totient φ(n) | 7260 |
| Square | 143496441 |
| Cube | 1718943866739 |
| Square root | 109.448618 (= 33√11) |
| Digit sum / digital root | 27 / 9 |
| Collatz steps to 1 | 187 |
| Scientific notation | 1.1979 × |
11979 in other forms
| Form | Value |
|---|---|
| In words | eleven thousand nine hundred and seventy-nine |
| Binary (base 2) | 10111011001011 |
| Octal (base 8) | 27313 |
| Hexadecimal (base 16) | 2ECB |
| Base 3 | 121102200 |
| As time | 11979 seconds = 3 h 19 min 39 s |
Is 11979 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | No (remainder 1) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | Yes (11979 ÷ 3 = 3993) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 3) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 4) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 3) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 2) | A number is divisible by 7 if double the last digit and subtract it from the rest: the result is a multiple of 7. |
| 8 | No (remainder 3) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | Yes (11979 ÷ 9 = 1331) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 9) | A number is divisible by 10 if the last digit is 0. |
| 11 | Yes (11979 ÷ 11 = 1089) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 3) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 11979 a prime number?
No. 11979 = × , so it is divisible by 3.
What are the factors of 11979?
1, 3, 9, 11, 33, 99, 121, 363, 1089, 1331, 3993, 11979.
What is 11979 in binary?
10111011001011 (hexadecimal 2ECB, octal 27313).
What is the square root of 11979?
About 109.4486, exactly 33√11.
Is 11979 divisible by 3?
Yes. Its digits add up to 27, a multiple of 3.
What is special about the number 11979?
It is a composite number with 12 divisors.