The number 11439
11439 is a composite number with 12 divisors. Its prime factorisation is × 31 × 41. Divisors (12): 1, 3, 9, 31, 41, 93, 123, 279, 369, 1271, 3813, 11439.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
11439 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
11439 is composite. Its prime factorisation is
- 3
The divisors add up to 17472; without 11439 itself that is 6033, so 11439 is deficient (6033 is less than 11439). Euler's totient φ(11439) = 7200 numbers up to 11439 share no factor with it.
- 4
The digits of 11439 add up to 18, and repeating that until one digit is left gives the digital root 9. The Collatz sequence (halve if even, else 3n+1) takes 55 steps to reach 1.
LaTeX source of the formulas on this page
\[ 11439 = 3^{2} \times 31 \times 41 \]11439 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 12 |
| Sum of divisors | 17472 |
| Euler totient φ(n) | 7200 |
| Square | 130850721 |
| Cube | 1496801397519 |
| Square root | 106.953261 (= 3√1271) |
| Digit sum / digital root | 18 / 9 |
| Collatz steps to 1 | 55 |
| Scientific notation | 1.1439 × |
11439 in other forms
| Form | Value |
|---|---|
| In words | eleven thousand four hundred and thirty-nine |
| Binary (base 2) | 10110010101111 |
| Octal (base 8) | 26257 |
| Hexadecimal (base 16) | 2CAF |
| Base 3 | 120200200 |
| As time | 11439 seconds = 3 h 10 min 39 s |
Is 11439 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 (11439 ÷ 3 = 3813) | 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 1) | 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 7) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | Yes (11439 ÷ 9 = 1271) | 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 | No (remainder 10) | 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 11439 a prime number?
No. 11439 = × 31 × 41, so it is divisible by 3.
What are the factors of 11439?
1, 3, 9, 31, 41, 93, 123, 279, 369, 1271, 3813, 11439.
What is 11439 in binary?
10110010101111 (hexadecimal 2CAF, octal 26257).
What is the square root of 11439?
About 106.9533, exactly 3√1271.
Is 11439 divisible by 3?
Yes. Its digits add up to 18, a multiple of 3.
What is special about the number 11439?
It is a composite number with 12 divisors.