The number 25342
25342 is a composite number with 4 divisors. Its prime factorisation is 2 × 12671. Divisors (4): 1, 2, 12671, 25342.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 25342: a semiprime: 2 × 12671, the product of two primes.
- 2
25342 is composite. Its prime factorisation is
- 3
The divisors add up to 38016; without 25342 itself that is 12674, so 25342 is deficient (12674 is less than 25342). Euler's totient φ(25342) = 12670 numbers up to 25342 share no factor with it.
- 4
The digits of 25342 add up to 16, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 157 steps to reach 1.
LaTeX source of the formulas on this page
\[ 25342 = 2 \times 12671 \]
25342 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 38016 |
| Euler totient φ(n) | 12670 |
| Square | 642216964 |
| Cube | 16275062301688 |
| Square root | 159.191708 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 157 |
| Scientific notation | 2.5342 × |
25342 in other forms
| Form | Value |
|---|---|
| In words | twenty-five thousand three hundred and forty-two |
| Binary (base 2) | 110001011111110 |
| Octal (base 8) | 61376 |
| Hexadecimal (base 16) | 62FE |
| Base 3 | 1021202121 |
| As time | 25342 seconds = 7 h 2 min 22 s |
Is 25342 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (25342 ÷ 2 = 12671) | 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 2) | 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 2) | 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 | No (remainder 2) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 9) | 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 25342 a prime number?
No. 25342 = 2 × 12671, so it is divisible by 2.
What are the factors of 25342?
1, 2, 12671, 25342.
What is 25342 in binary?
110001011111110 (hexadecimal 62FE, octal 61376).
What is the square root of 25342?
About 159.1917.
Is 25342 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 25342?
25342 is a semiprime: 2 × 12671, the product of two primes.