The number 25240
25240 is a composite number with 16 divisors. Its prime factorisation is × 5 × 631. Divisors (16): 1, 2, 4, 5, 8, 10, 20, 40, 631, 1262, 2524, 3155, 5048, 6310, 12620, 25240.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 25240: a happy number: repeatedly adding the squares of its digits reaches 1.
- 2
25240 is composite. Its prime factorisation is
- 3
The divisors add up to 56880; without 25240 itself that is 31640, so 25240 is abundant (31640 is more than 25240). Euler's totient φ(25240) = 10080 numbers up to 25240 share no factor with it.
- 4
The digits of 25240 add up to 13, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 95 steps to reach 1.
LaTeX source of the formulas on this page
\[ 25240 = 2^{3} \times 5 \times 631 \]25240 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 56880 |
| Euler totient φ(n) | 10080 |
| Square | 637057600 |
| Cube | 16079333824000 |
| Square root | 158.871017 (= 2√6310) |
| Digit sum / digital root | 13 / 4 |
| Collatz steps to 1 | 95 |
| Scientific notation | 2.524 × |
25240 in other forms
| Form | Value |
|---|---|
| In words | twenty-five thousand two hundred and forty |
| Binary (base 2) | 110001010011000 |
| Octal (base 8) | 61230 |
| Hexadecimal (base 16) | 6298 |
| Base 3 | 1021121211 |
| As time | 25240 seconds = 7 h 0 min 40 s |
Is 25240 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (25240 ÷ 2 = 12620) | 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 | Yes (25240 ÷ 4 = 6310) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (25240 ÷ 5 = 5048) | 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 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 | Yes (25240 ÷ 8 = 3155) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 4) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | Yes (25240 ÷ 10 = 2524) | 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 4) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 25240 a prime number?
No. 25240 = × 5 × 631, so it is divisible by 2.
What are the factors of 25240?
1, 2, 4, 5, 8, 10, 20, 40, 631, 1262, 2524, 3155, 5048, 6310, 12620, 25240.
What is 25240 in binary?
110001010011000 (hexadecimal 6298, octal 61230).
What is the square root of 25240?
About 158.8710, exactly 2√6310.
Is 25240 divisible by 3?
No. Its digits add up to 13, which is not a multiple of 3.
What is special about the number 25240?
25240 is a happy number: repeatedly adding the squares of its digits reaches 1.