The number 27381
27381 is a composite number with 4 divisors. Its prime factorisation is 3 × 9127. Divisors (4): 1, 3, 9127, 27381.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 27381: a semiprime: 3 × 9127, the product of two primes.
- 2
27381 is composite. Its prime factorisation is
- 3
The divisors add up to 36512; without 27381 itself that is 9131, so 27381 is deficient (9131 is less than 27381). Euler's totient φ(27381) = 18252 numbers up to 27381 share no factor with it.
- 4
The digits of 27381 add up to 21, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 152 steps to reach 1.
LaTeX source of the formulas on this page
\[ 27381 = 3 \times 9127 \]
27381 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 36512 |
| Euler totient φ(n) | 18252 |
| Square | 749719161 |
| Cube | 20528060347341 |
| Square root | 165.472052 |
| Digit sum / digital root | 21 / 3 |
| Collatz steps to 1 | 152 |
| Scientific notation | 2.7381 × |
27381 in other forms
| Form | Value |
|---|---|
| In words | twenty-seven thousand three hundred and eighty-one |
| Binary (base 2) | 110101011110101 |
| Octal (base 8) | 65365 |
| Hexadecimal (base 16) | 6AF5 |
| Base 3 | 1101120010 |
| As time | 27381 seconds = 7 h 36 min 21 s |
Is 27381 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 (27381 ÷ 3 = 9127) | 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 3) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 4) | 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 3) | 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 9) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 27381 a prime number?
No. 27381 = 3 × 9127, so it is divisible by 3.
What are the factors of 27381?
1, 3, 9127, 27381.
What is 27381 in binary?
110101011110101 (hexadecimal 6AF5, octal 65365).
What is the square root of 27381?
About 165.4721.
Is 27381 divisible by 3?
Yes. Its digits add up to 21, a multiple of 3.
What is special about the number 27381?
27381 is a semiprime: 3 × 9127, the product of two primes.