The number 40831
40831 is a composite number with 8 divisors. Its prime factorisation is 7 × 19 × 307. Divisors (8): 1, 7, 19, 133, 307, 2149, 5833, 40831.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
40831 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
40831 is composite. Its prime factorisation is
- 3
The divisors add up to 49280; without 40831 itself that is 8449, so 40831 is deficient (8449 is less than 40831). Euler's totient φ(40831) = 33048 numbers up to 40831 share no factor with it.
- 4
The digits of 40831 add up to 16, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 168 steps to reach 1.
LaTeX source of the formulas on this page
\[ 40831 = 7 \times 19 \times 307 \]
40831 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 49280 |
| Euler totient φ(n) | 33048 |
| Square | 1667170561 |
| Cube | 68072241176191 |
| Square root | 202.066821 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 168 |
| Scientific notation | 4.0831 × |
40831 in other forms
| Form | Value |
|---|---|
| In words | forty thousand eight hundred and thirty-one |
| Binary (base 2) | 1001111101111111 |
| Octal (base 8) | 117577 |
| Hexadecimal (base 16) | 9F7F |
| Base 3 | 2002000021 |
| As time | 40831 seconds = 11 h 20 min 31 s |
Is 40831 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 | No (remainder 1) | 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 1) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 1) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | Yes (40831 ÷ 7 = 5833) | 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 | No (remainder 7) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 1) | 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 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 40831 a prime number?
No. 40831 = 7 × 19 × 307, so it is divisible by 7.
What are the factors of 40831?
1, 7, 19, 133, 307, 2149, 5833, 40831.
What is 40831 in binary?
1001111101111111 (hexadecimal 9F7F, octal 117577).
What is the square root of 40831?
About 202.0668.
Is 40831 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 40831?
It is a composite number with 8 divisors.