The number 40731
40731 is a composite number with 4 divisors. Its prime factorisation is 3 × 13577. Divisors (4): 1, 3, 13577, 40731.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 40731: a semiprime: 3 × 13577, the product of two primes.
- 2
40731 is composite. Its prime factorisation is
- 3
The divisors add up to 54312; without 40731 itself that is 13581, so 40731 is deficient (13581 is less than 40731). Euler's totient φ(40731) = 27152 numbers up to 40731 share no factor with it.
- 4
The digits of 40731 add up to 15, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 181 steps to reach 1.
LaTeX source of the formulas on this page
\[ 40731 = 3 \times 13577 \]
40731 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 54312 |
| Euler totient φ(n) | 27152 |
| Square | 1659014361 |
| Cube | 67573313937891 |
| Square root | 201.819226 |
| Digit sum / digital root | 15 / 6 |
| Collatz steps to 1 | 181 |
| Scientific notation | 4.0731 × |
40731 in other forms
| Form | Value |
|---|---|
| In words | forty thousand seven hundred and thirty-one |
| Binary (base 2) | 1001111100011011 |
| Octal (base 8) | 117433 |
| Hexadecimal (base 16) | 9F1B |
| Base 3 | 2001212120 |
| As time | 40731 seconds = 11 h 18 min 51 s |
Is 40731 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 (40731 ÷ 3 = 13577) | 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 3) | 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 3) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 6) | 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 9) | 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 40731 a prime number?
No. 40731 = 3 × 13577, so it is divisible by 3.
What are the factors of 40731?
1, 3, 13577, 40731.
What is 40731 in binary?
1001111100011011 (hexadecimal 9F1B, octal 117433).
What is the square root of 40731?
About 201.8192.
Is 40731 divisible by 3?
Yes. Its digits add up to 15, a multiple of 3.
What is special about the number 40731?
40731 is a semiprime: 3 × 13577, the product of two primes.