The number 40981
40981 is a composite number with 4 divisors. Its prime factorisation is 107 × 383. Divisors (4): 1, 107, 383, 40981.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 40981: a semiprime: 107 × 383, the product of two primes.
- 2
40981 is composite. Its prime factorisation is
- 3
The divisors add up to 41472; without 40981 itself that is 491, so 40981 is deficient (491 is less than 40981). Euler's totient φ(40981) = 40492 numbers up to 40981 share no factor with it.
- 4
The digits of 40981 add up to 22, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 150 steps to reach 1.
LaTeX source of the formulas on this page
\[ 40981 = 107 \times 383 \]
40981 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 41472 |
| Euler totient φ(n) | 40492 |
| Square | 1679442361 |
| Cube | 68825227396141 |
| Square root | 202.437645 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 150 |
| Scientific notation | 4.0981 × |
40981 in other forms
| Form | Value |
|---|---|
| In words | forty thousand nine hundred and eighty-one |
| Binary (base 2) | 1010000000010101 |
| Octal (base 8) | 120025 |
| Hexadecimal (base 16) | A015 |
| Base 3 | 2002012211 |
| As time | 40981 seconds = 11 h 23 min 1 s |
Is 40981 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 3) | 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 4) | 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 6) | 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 40981 a prime number?
No. 40981 = 107 × 383, so it is divisible by 107.
What are the factors of 40981?
1, 107, 383, 40981.
What is 40981 in binary?
1010000000010101 (hexadecimal A015, octal 120025).
What is the square root of 40981?
About 202.4376.
Is 40981 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 40981?
40981 is a semiprime: 107 × 383, the product of two primes.