The number 27389
27389 is a composite number with 4 divisors. Its prime factorisation is 61 × 449. Divisors (4): 1, 61, 449, 27389.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 27389: a semiprime: 61 × 449, the product of two primes.
- 2
27389 is composite. Its prime factorisation is
- 3
The divisors add up to 27900; without 27389 itself that is 511, so 27389 is deficient (511 is less than 27389). Euler's totient φ(27389) = 26880 numbers up to 27389 share no factor with it.
- 4
The digits of 27389 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 64 steps to reach 1.
LaTeX source of the formulas on this page
\[ 27389 = 61 \times 449 \]
27389 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 27900 |
| Euler totient φ(n) | 26880 |
| Square | 750157321 |
| Cube | 20546058864869 |
| Square root | 165.496224 |
| Digit sum / digital root | 29 / 2 |
| Collatz steps to 1 | 64 |
| Scientific notation | 2.7389 × |
27389 in other forms
| Form | Value |
|---|---|
| In words | twenty-seven thousand three hundred and eighty-nine |
| Binary (base 2) | 110101011111101 |
| Octal (base 8) | 65375 |
| Hexadecimal (base 16) | 6AFD |
| Base 3 | 1101120102 |
| As time | 27389 seconds = 7 h 36 min 29 s |
Is 27389 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 4) | 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 9) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 10) | 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 27389 a prime number?
No. 27389 = 61 × 449, so it is divisible by 61.
What are the factors of 27389?
1, 61, 449, 27389.
What is 27389 in binary?
110101011111101 (hexadecimal 6AFD, octal 65375).
What is the square root of 27389?
About 165.4962.
Is 27389 divisible by 3?
No. Its digits add up to 29, which is not a multiple of 3.
What is special about the number 27389?
27389 is a semiprime: 61 × 449, the product of two primes.