The number 42542
42542 is a composite number with 8 divisors. Its prime factorisation is 2 × 89 × 239. Divisors (8): 1, 2, 89, 178, 239, 478, 21271, 42542.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
42542 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
42542 is composite. Its prime factorisation is
- 3
The divisors add up to 64800; without 42542 itself that is 22258, so 42542 is deficient (22258 is less than 42542). Euler's totient φ(42542) = 20944 numbers up to 42542 share no factor with it.
- 4
The digits of 42542 add up to 17, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 57 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42542 = 2 \times 89 \times 239 \]
42542 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 64800 |
| Euler totient φ(n) | 20944 |
| Square | 1809821764 |
| Cube | 76993437484088 |
| Square root | 206.257121 |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 57 |
| Scientific notation | 4.2542 × |
42542 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand five hundred and forty-two |
| Binary (base 2) | 1010011000101110 |
| Octal (base 8) | 123056 |
| Hexadecimal (base 16) | A62E |
| Base 3 | 2011100122 |
| As time | 42542 seconds = 11 h 49 min 2 s |
Is 42542 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (42542 ÷ 2 = 21271) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 2) | 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 2) | 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 6) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 8) | 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 5) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42542 a prime number?
No. 42542 = 2 × 89 × 239, so it is divisible by 2.
What are the factors of 42542?
1, 2, 89, 178, 239, 478, 21271, 42542.
What is 42542 in binary?
1010011000101110 (hexadecimal A62E, octal 123056).
What is the square root of 42542?
About 206.2571.
Is 42542 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 42542?
It is a composite number with 8 divisors.