The number 25042
25042 is a composite number with 8 divisors. Its prime factorisation is 2 × 19 × 659. Divisors (8): 1, 2, 19, 38, 659, 1318, 12521, 25042.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 25042: a happy number: repeatedly adding the squares of its digits reaches 1.
- 2
25042 is composite. Its prime factorisation is
- 3
The divisors add up to 39600; without 25042 itself that is 14558, so 25042 is deficient (14558 is less than 25042). Euler's totient φ(25042) = 11844 numbers up to 25042 share no factor with it.
- 4
The digits of 25042 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 64 steps to reach 1.
LaTeX source of the formulas on this page
\[ 25042 = 2 \times 19 \times 659 \]
25042 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 39600 |
| Euler totient φ(n) | 11844 |
| Square | 627101764 |
| Cube | 15703882374088 |
| Square root | 158.246643 |
| Digit sum / digital root | 13 / 4 |
| Collatz steps to 1 | 64 |
| Scientific notation | 2.5042 × |
25042 in other forms
| Form | Value |
|---|---|
| In words | twenty-five thousand and forty-two |
| Binary (base 2) | 110000111010010 |
| Octal (base 8) | 60722 |
| Hexadecimal (base 16) | 61D2 |
| Base 3 | 1021100111 |
| As time | 25042 seconds = 6 h 57 min 22 s |
Is 25042 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (25042 ÷ 2 = 12521) | 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 3) | 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 4) | 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 6) | 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 25042 a prime number?
No. 25042 = 2 × 19 × 659, so it is divisible by 2.
What are the factors of 25042?
1, 2, 19, 38, 659, 1318, 12521, 25042.
What is 25042 in binary?
110000111010010 (hexadecimal 61D2, octal 60722).
What is the square root of 25042?
About 158.2466.
Is 25042 divisible by 3?
No. Its digits add up to 13, which is not a multiple of 3.
What is special about the number 25042?
25042 is a happy number: repeatedly adding the squares of its digits reaches 1.