The number 26989
26989 is a composite number with 4 divisors. Its prime factorisation is 137 × 197. Divisors (4): 1, 137, 197, 26989.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 26989: a semiprime: 137 × 197, the product of two primes.
- 2
26989 is composite. Its prime factorisation is
- 3
The divisors add up to 27324; without 26989 itself that is 335, so 26989 is deficient (335 is less than 26989). Euler's totient φ(26989) = 26656 numbers up to 26989 share no factor with it.
- 4
The digits of 26989 add up to 34, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 183 steps to reach 1.
LaTeX source of the formulas on this page
\[ 26989 = 137 \times 197 \]
26989 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 27324 |
| Euler totient φ(n) | 26656 |
| Square | 728406121 |
| Cube | 19658952799669 |
| Square root | 164.283292 |
| Digit sum / digital root | 34 / 7 |
| Collatz steps to 1 | 183 |
| Scientific notation | 2.6989 × |
26989 in other forms
| Form | Value |
|---|---|
| In words | twenty-six thousand nine hundred and eighty-nine |
| Binary (base 2) | 110100101101101 |
| Octal (base 8) | 64555 |
| Hexadecimal (base 16) | 696D |
| Base 3 | 1101000121 |
| As time | 26989 seconds = 7 h 29 min 49 s |
Is 26989 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 1) | 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 1) | 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 7) | 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 6) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 26989 a prime number?
No. 26989 = 137 × 197, so it is divisible by 137.
What are the factors of 26989?
1, 137, 197, 26989.
What is 26989 in binary?
110100101101101 (hexadecimal 696D, octal 64555).
What is the square root of 26989?
About 164.2833.
Is 26989 divisible by 3?
No. Its digits add up to 34, which is not a multiple of 3.
What is special about the number 26989?
26989 is a semiprime: 137 × 197, the product of two primes.