The number 42639
42639 is a composite number with 8 divisors. Its prime factorisation is 3 × 61 × 233. Divisors (8): 1, 3, 61, 183, 233, 699, 14213, 42639.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
42639 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
42639 is composite. Its prime factorisation is
- 3
The divisors add up to 58032; without 42639 itself that is 15393, so 42639 is deficient (15393 is less than 42639). Euler's totient φ(42639) = 27840 numbers up to 42639 share no factor with it.
- 4
The digits of 42639 add up to 24, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 101 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42639 = 3 \times 61 \times 233 \]
42639 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 58032 |
| Euler totient φ(n) | 27840 |
| Square | 1818084321 |
| Cube | 77521297363119 |
| Square root | 206.492131 |
| Digit sum / digital root | 24 / 6 |
| Collatz steps to 1 | 101 |
| Scientific notation | 4.2639 × |
42639 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand six hundred and thirty-nine |
| Binary (base 2) | 1010011010001111 |
| Octal (base 8) | 123217 |
| Hexadecimal (base 16) | A68F |
| Base 3 | 2011111020 |
| As time | 42639 seconds = 11 h 50 min 39 s |
Is 42639 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 | Yes (42639 ÷ 3 = 14213) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 3) | 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 3) | 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 7) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 6) | 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 3) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 3) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42639 a prime number?
No. 42639 = 3 × 61 × 233, so it is divisible by 3.
What are the factors of 42639?
1, 3, 61, 183, 233, 699, 14213, 42639.
What is 42639 in binary?
1010011010001111 (hexadecimal A68F, octal 123217).
What is the square root of 42639?
About 206.4921.
Is 42639 divisible by 3?
Yes. Its digits add up to 24, a multiple of 3.
What is special about the number 42639?
It is a composite number with 8 divisors.