The number 38981
38981 is a composite number with 4 divisors. Its prime factorisation is 17 × 2293. Divisors (4): 1, 17, 2293, 38981.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 38981: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 17 × 2293, the product of two primes.
- 2
38981 is composite. Its prime factorisation is
- 3
The divisors add up to 41292; without 38981 itself that is 2311, so 38981 is deficient (2311 is less than 38981). Euler's totient φ(38981) = 36672 numbers up to 38981 share no factor with it.
- 4
The digits of 38981 add up to 29, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 137 steps to reach 1.
LaTeX source of the formulas on this page
\[ 38981 = 17 \times 2293 \]
38981 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 41292 |
| Euler totient φ(n) | 36672 |
| Square | 1519518361 |
| Cube | 59232345230141 |
| Square root | 197.436066 |
| Digit sum / digital root | 29 / 2 |
| Collatz steps to 1 | 137 |
| Scientific notation | 3.8981 × |
38981 in other forms
| Form | Value |
|---|---|
| In words | thirty-eight thousand nine hundred and eighty-one |
| Binary (base 2) | 1001100001000101 |
| Octal (base 8) | 114105 |
| Hexadecimal (base 16) | 9845 |
| Base 3 | 1222110202 |
| As time | 38981 seconds = 10 h 49 min 41 s |
Is 38981 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 2) | 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 5) | 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 2) | 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 8) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 38981 a prime number?
No. 38981 = 17 × 2293, so it is divisible by 17.
What are the factors of 38981?
1, 17, 2293, 38981.
What is 38981 in binary?
1001100001000101 (hexadecimal 9845, octal 114105).
What is the square root of 38981?
About 197.4361.
Is 38981 divisible by 3?
No. Its digits add up to 29, which is not a multiple of 3.
What is special about the number 38981?
38981 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 17 × 2293, the product of two primes.