The number 13239
13239 is a composite number with 6 divisors. Its prime factorisation is × 1471. Divisors (6): 1, 3, 9, 1471, 4413, 13239.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
13239 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
13239 is composite. Its prime factorisation is
- 3
The divisors add up to 19136; without 13239 itself that is 5897, so 13239 is deficient (5897 is less than 13239). Euler's totient φ(13239) = 8820 numbers up to 13239 share no factor with it.
- 4
The digits of 13239 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 138 steps to reach 1.
LaTeX source of the formulas on this page
\[ 13239 = 3^{2} \times 1471 \]13239 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 6 |
| Sum of divisors | 19136 |
| Euler totient φ(n) | 8820 |
| Square | 175271121 |
| Cube | 2320414370919 |
| Square root | 115.060853 (= 3√1471) |
| Digit sum / digital root | 18 / 9 |
| Collatz steps to 1 | 138 |
| Scientific notation | 1.3239 × |
13239 in other forms
| Form | Value |
|---|---|
| In words | thirteen thousand two hundred and thirty-nine |
| Binary (base 2) | 11001110110111 |
| Octal (base 8) | 31667 |
| Hexadecimal (base 16) | 33B7 |
| Base 3 | 200011100 |
| As time | 13239 seconds = 3 h 40 min 39 s |
Is 13239 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 (13239 ÷ 3 = 4413) | 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 7) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | Yes (13239 ÷ 9 = 1471) | 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 6) | 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 13239 a prime number?
No. 13239 = × 1471, so it is divisible by 3.
What are the factors of 13239?
1, 3, 9, 1471, 4413, 13239.
What is 13239 in binary?
11001110110111 (hexadecimal 33B7, octal 31667).
What is the square root of 13239?
About 115.0609, exactly 3√1471.
Is 13239 divisible by 3?
Yes. Its digits add up to 18, a multiple of 3.
What is special about the number 13239?
It is a composite number with 6 divisors.