The number 31708
31708 is a composite number with 6 divisors. Its prime factorisation is × 7927. Divisors (6): 1, 2, 4, 7927, 15854, 31708.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
31708 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
31708 is composite. Its prime factorisation is
- 3
The divisors add up to 55496; without 31708 itself that is 23788, so 31708 is deficient (23788 is less than 31708). Euler's totient φ(31708) = 15852 numbers up to 31708 share no factor with it.
- 4
The digits of 31708 add up to 19, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 54 steps to reach 1.
LaTeX source of the formulas on this page
\[ 31708 = 2^{2} \times 7927 \]31708 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 6 |
| Sum of divisors | 55496 |
| Euler totient φ(n) | 15852 |
| Square | 1005397264 |
| Cube | 31879136446912 |
| Square root | 178.067403 (= 2√7927) |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 54 |
| Scientific notation | 3.1708 × |
31708 in other forms
| Form | Value |
|---|---|
| In words | thirty-one thousand seven hundred and eight |
| Binary (base 2) | 111101111011100 |
| Octal (base 8) | 75734 |
| Hexadecimal (base 16) | 7BDC |
| Base 3 | 1121111101 |
| As time | 31708 seconds = 8 h 48 min 28 s |
Is 31708 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (31708 ÷ 2 = 15854) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 1) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | Yes (31708 ÷ 4 = 7927) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 3) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 4) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 5) | 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 4) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 1) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 8) | 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 4) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 31708 a prime number?
No. 31708 = × 7927, so it is divisible by 2.
What are the factors of 31708?
1, 2, 4, 7927, 15854, 31708.
What is 31708 in binary?
111101111011100 (hexadecimal 7BDC, octal 75734).
What is the square root of 31708?
About 178.0674, exactly 2√7927.
Is 31708 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 31708?
It is a composite number with 6 divisors.