The number 25429
25429 is a composite number with 4 divisors. Its prime factorisation is 59 × 431. Divisors (4): 1, 59, 431, 25429.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 25429: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 59 × 431, the product of two primes.
- 2
25429 is composite. Its prime factorisation is
- 3
The divisors add up to 25920; without 25429 itself that is 491, so 25429 is deficient (491 is less than 25429). Euler's totient φ(25429) = 24940 numbers up to 25429 share no factor with it.
- 4
The digits of 25429 add up to 22, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 33 steps to reach 1.
LaTeX source of the formulas on this page
\[ 25429 = 59 \times 431 \]
25429 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 25920 |
| Euler totient φ(n) | 24940 |
| Square | 646634041 |
| Cube | 16443257028589 |
| Square root | 159.464730 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 33 |
| Scientific notation | 2.5429 × |
25429 in other forms
| Form | Value |
|---|---|
| In words | twenty-five thousand four hundred and twenty-nine |
| Binary (base 2) | 110001101010101 |
| Octal (base 8) | 61525 |
| Hexadecimal (base 16) | 6355 |
| Base 3 | 1021212211 |
| As time | 25429 seconds = 7 h 3 min 49 s |
Is 25429 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 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 | No (remainder 5) | 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 | No (remainder 9) | 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 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 25429 a prime number?
No. 25429 = 59 × 431, so it is divisible by 59.
What are the factors of 25429?
1, 59, 431, 25429.
What is 25429 in binary?
110001101010101 (hexadecimal 6355, octal 61525).
What is the square root of 25429?
About 159.4647.
Is 25429 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 25429?
25429 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 59 × 431, the product of two primes.