The number 25990
25990 is a composite number with 16 divisors. Its prime factorisation is 2 × 5 × 23 × 113. Divisors (16): 1, 2, 5, 10, 23, 46, 113, 115, 226, 230, 565, 1130, 2599, 5198, 12995, 25990.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
25990 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
25990 is composite. Its prime factorisation is
- 3
The divisors add up to 49248; without 25990 itself that is 23258, so 25990 is deficient (23258 is less than 25990). Euler's totient φ(25990) = 9856 numbers up to 25990 share no factor with it.
- 4
The digits of 25990 add up to 25, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 126 steps to reach 1.
LaTeX source of the formulas on this page
\[ 25990 = 2 \times 5 \times 23 \times 113 \]
25990 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 49248 |
| Euler totient φ(n) | 9856 |
| Square | 675480100 |
| Cube | 17555727799000 |
| Square root | 161.214143 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 126 |
| Scientific notation | 2.599 × |
25990 in other forms
| Form | Value |
|---|---|
| In words | twenty-five thousand nine hundred and ninety |
| Binary (base 2) | 110010110000110 |
| Octal (base 8) | 62606 |
| Hexadecimal (base 16) | 6586 |
| Base 3 | 1022122121 |
| As time | 25990 seconds = 7 h 13 min 10 s |
Is 25990 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (25990 ÷ 2 = 12995) | 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 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (25990 ÷ 5 = 5198) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 4) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 6) | 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 6) | 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 | Yes (25990 ÷ 10 = 2599) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 8) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 25990 a prime number?
No. 25990 = 2 × 5 × 23 × 113, so it is divisible by 2.
What are the factors of 25990?
1, 2, 5, 10, 23, 46, 113, 115, 226, 230, 565, 1130, 2599, 5198, 12995, 25990.
What is 25990 in binary?
110010110000110 (hexadecimal 6586, octal 62606).
What is the square root of 25990?
About 161.2141.
Is 25990 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 25990?
It is a composite number with 16 divisors.