The number 38381
38381 is a composite number with 4 divisors. Its prime factorisation is 7 × 5483. Divisors (4): 1, 7, 5483, 38381.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 38381: a semiprime: 7 × 5483, the product of two primes.
- 2
38381 is composite. Its prime factorisation is
- 3
The divisors add up to 43872; without 38381 itself that is 5491, so 38381 is deficient (5491 is less than 38381). Euler's totient φ(38381) = 32892 numbers up to 38381 share no factor with it.
- 4
The digits of 38381 add up to 23, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 75 steps to reach 1.
LaTeX source of the formulas on this page
\[ 38381 = 7 \times 5483 \]
38381 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 43872 |
| Euler totient φ(n) | 32892 |
| Square | 1473101161 |
| Cube | 56539095660341 |
| Square root | 195.910694 |
| Digit sum / digital root | 23 / 5 |
| Collatz steps to 1 | 75 |
| Scientific notation | 3.8381 × |
38381 in other forms
| Form | Value |
|---|---|
| In words | thirty-eight thousand three hundred and eighty-one |
| Binary (base 2) | 1001010111101101 |
| Octal (base 8) | 112755 |
| Hexadecimal (base 16) | 95ED |
| Base 3 | 1221122112 |
| As time | 38381 seconds = 10 h 39 min 41 s |
Is 38381 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 | Yes (38381 ÷ 7 = 5483) | 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 5) | 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 2) | 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 38381 a prime number?
No. 38381 = 7 × 5483, so it is divisible by 7.
What are the factors of 38381?
1, 7, 5483, 38381.
What is 38381 in binary?
1001010111101101 (hexadecimal 95ED, octal 112755).
What is the square root of 38381?
About 195.9107.
Is 38381 divisible by 3?
No. Its digits add up to 23, which is not a multiple of 3.
What is special about the number 38381?
38381 is a semiprime: 7 × 5483, the product of two primes.