The number 31442
31442 is a composite number with 8 divisors. Its prime factorisation is 2 × 79 × 199. Divisors (8): 1, 2, 79, 158, 199, 398, 15721, 31442.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
31442 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
31442 is composite. Its prime factorisation is
- 3
The divisors add up to 48000; without 31442 itself that is 16558, so 31442 is deficient (16558 is less than 31442). Euler's totient φ(31442) = 15444 numbers up to 31442 share no factor with it.
- 4
The digits of 31442 add up to 14, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 85 steps to reach 1.
LaTeX source of the formulas on this page
\[ 31442 = 2 \times 79 \times 199 \]
31442 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 48000 |
| Euler totient φ(n) | 15444 |
| Square | 988599364 |
| Cube | 31083541202888 |
| Square root | 177.318922 |
| Digit sum / digital root | 14 / 5 |
| Collatz steps to 1 | 85 |
| Scientific notation | 3.1442 × |
31442 in other forms
| Form | Value |
|---|---|
| In words | thirty-one thousand four hundred and forty-two |
| Binary (base 2) | 111101011010010 |
| Octal (base 8) | 75322 |
| Hexadecimal (base 16) | 7AD2 |
| Base 3 | 1121010112 |
| As time | 31442 seconds = 8 h 44 min 2 s |
Is 31442 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (31442 ÷ 2 = 15721) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 2) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 2) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 2) | 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 2) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 5) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 2) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 4) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 31442 a prime number?
No. 31442 = 2 × 79 × 199, so it is divisible by 2.
What are the factors of 31442?
1, 2, 79, 158, 199, 398, 15721, 31442.
What is 31442 in binary?
111101011010010 (hexadecimal 7AD2, octal 75322).
What is the square root of 31442?
About 177.3189.
Is 31442 divisible by 3?
No. Its digits add up to 14, which is not a multiple of 3.
What is special about the number 31442?
It is a composite number with 8 divisors.