The number 40381
40381 is a composite number with 4 divisors. Its prime factorisation is 11 × 3671. Divisors (4): 1, 11, 3671, 40381.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 40381: a semiprime: 11 × 3671, the product of two primes.
- 2
40381 is composite. Its prime factorisation is
- 3
The divisors add up to 44064; without 40381 itself that is 3683, so 40381 is deficient (3683 is less than 40381). Euler's totient φ(40381) = 36700 numbers up to 40381 share no factor with it.
- 4
The digits of 40381 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 150 steps to reach 1.
LaTeX source of the formulas on this page
\[ 40381 = 11 \times 3671 \]
40381 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 44064 |
| Euler totient φ(n) | 36700 |
| Square | 1630625161 |
| Cube | 65846274626341 |
| Square root | 200.950243 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 150 |
| Scientific notation | 4.0381 × |
40381 in other forms
| Form | Value |
|---|---|
| In words | forty thousand three hundred and eighty-one |
| Binary (base 2) | 1001110110111101 |
| Octal (base 8) | 116675 |
| Hexadecimal (base 16) | 9DBD |
| Base 3 | 2001101121 |
| As time | 40381 seconds = 11 h 13 min 1 s |
Is 40381 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 1) | 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 | 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 5) | 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 | Yes (40381 ÷ 11 = 3671) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 40381 a prime number?
No. 40381 = 11 × 3671, so it is divisible by 11.
What are the factors of 40381?
1, 11, 3671, 40381.
What is 40381 in binary?
1001110110111101 (hexadecimal 9DBD, octal 116675).
What is the square root of 40381?
About 200.9502.
Is 40381 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 40381?
40381 is a semiprime: 11 × 3671, the product of two primes.