The number 27989
27989 is a composite number with 4 divisors. Its prime factorisation is 13 × 2153. Divisors (4): 1, 13, 2153, 27989.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 27989: a semiprime: 13 × 2153, the product of two primes.
- 2
27989 is composite. Its prime factorisation is
- 3
The divisors add up to 30156; without 27989 itself that is 2167, so 27989 is deficient (2167 is less than 27989). Euler's totient φ(27989) = 25824 numbers up to 27989 share no factor with it.
- 4
The digits of 27989 add up to 35, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 121 steps to reach 1.
LaTeX source of the formulas on this page
\[ 27989 = 13 \times 2153 \]
27989 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 30156 |
| Euler totient φ(n) | 25824 |
| Square | 783384121 |
| Cube | 21926138162669 |
| Square root | 167.299133 |
| Digit sum / digital root | 35 / 8 |
| Collatz steps to 1 | 121 |
| Scientific notation | 2.7989 × |
27989 in other forms
| Form | Value |
|---|---|
| In words | twenty-seven thousand nine hundred and eighty-nine |
| Binary (base 2) | 110110101010101 |
| Octal (base 8) | 66525 |
| Hexadecimal (base 16) | 6D55 |
| Base 3 | 1102101122 |
| As time | 27989 seconds = 7 h 46 min 29 s |
Is 27989 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 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 8) | 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 5) | 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 27989 a prime number?
No. 27989 = 13 × 2153, so it is divisible by 13.
What are the factors of 27989?
1, 13, 2153, 27989.
What is 27989 in binary?
110110101010101 (hexadecimal 6D55, octal 66525).
What is the square root of 27989?
About 167.2991.
Is 27989 divisible by 3?
No. Its digits add up to 35, which is not a multiple of 3.
What is special about the number 27989?
27989 is a semiprime: 13 × 2153, the product of two primes.