The number 25498
25498 is a composite number with 16 divisors. Its prime factorisation is 2 × 11 × 19 × 61. Divisors (16): 1, 2, 11, 19, 22, 38, 61, 122, 209, 418, 671, 1159, 1342, 2318, 12749, 25498.
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How to work it out
- 1
What is special about 25498: a happy number: repeatedly adding the squares of its digits reaches 1.
- 2
25498 is composite. Its prime factorisation is
- 3
The divisors add up to 44640; without 25498 itself that is 19142, so 25498 is deficient (19142 is less than 25498). Euler's totient φ(25498) = 10800 numbers up to 25498 share no factor with it.
- 4
The digits of 25498 add up to 28, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 126 steps to reach 1.
LaTeX source of the formulas on this page
\[ 25498 = 2 \times 11 \times 19 \times 61 \]
25498 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 44640 |
| Euler totient φ(n) | 10800 |
| Square | 650148004 |
| Cube | 16577473805992 |
| Square root | 159.680932 |
| Digit sum / digital root | 28 / 1 |
| Collatz steps to 1 | 126 |
| Scientific notation | 2.5498 × |
25498 in other forms
| Form | Value |
|---|---|
| In words | twenty-five thousand four hundred and ninety-eight |
| Binary (base 2) | 110001110011010 |
| Octal (base 8) | 61632 |
| Hexadecimal (base 16) | 639A |
| Base 3 | 1021222101 |
| As time | 25498 seconds = 7 h 4 min 58 s |
Is 25498 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (25498 ÷ 2 = 12749) | 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 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 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 | Yes (25498 ÷ 11 = 2318) | 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 25498 a prime number?
No. 25498 = 2 × 11 × 19 × 61, so it is divisible by 2.
What are the factors of 25498?
1, 2, 11, 19, 22, 38, 61, 122, 209, 418, 671, 1159, 1342, 2318, 12749, 25498.
What is 25498 in binary?
110001110011010 (hexadecimal 639A, octal 61632).
What is the square root of 25498?
About 159.6809.
Is 25498 divisible by 3?
No. Its digits add up to 28, which is not a multiple of 3.
What is special about the number 25498?
25498 is a happy number: repeatedly adding the squares of its digits reaches 1.