The number 25138
25138 is a composite number with 4 divisors. Its prime factorisation is 2 × 12569. Divisors (4): 1, 2, 12569, 25138.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 25138: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 2 × 12569, the product of two primes.
- 2
25138 is composite. Its prime factorisation is
- 3
The divisors add up to 37710; without 25138 itself that is 12572, so 25138 is deficient (12572 is less than 25138). Euler's totient φ(25138) = 12568 numbers up to 25138 share no factor with it.
- 4
The digits of 25138 add up to 19, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 157 steps to reach 1.
LaTeX source of the formulas on this page
\[ 25138 = 2 \times 12569 \]
25138 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 37710 |
| Euler totient φ(n) | 12568 |
| Square | 631919044 |
| Cube | 15885180928072 |
| Square root | 158.549677 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 157 |
| Scientific notation | 2.5138 × |
25138 in other forms
| Form | Value |
|---|---|
| In words | twenty-five thousand one hundred and thirty-eight |
| Binary (base 2) | 110001000110010 |
| Octal (base 8) | 61062 |
| Hexadecimal (base 16) | 6232 |
| Base 3 | 1021111001 |
| As time | 25138 seconds = 6 h 58 min 58 s |
Is 25138 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (25138 ÷ 2 = 12569) | 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 | No (remainder 3) | 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 1) | 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 2) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 1) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 8) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 3) | 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 25138 a prime number?
No. 25138 = 2 × 12569, so it is divisible by 2.
What are the factors of 25138?
1, 2, 12569, 25138.
What is 25138 in binary?
110001000110010 (hexadecimal 6232, octal 61062).
What is the square root of 25138?
About 158.5497.
Is 25138 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 25138?
25138 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 2 × 12569, the product of two primes.