The number 42939
42939 is a composite number with 12 divisors. Its prime factorisation is × 13 × 367. Divisors (12): 1, 3, 9, 13, 39, 117, 367, 1101, 3303, 4771, 14313, 42939.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
42939 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
42939 is composite. Its prime factorisation is
- 3
The divisors add up to 66976; without 42939 itself that is 24037, so 42939 is deficient (24037 is less than 42939). Euler's totient φ(42939) = 26352 numbers up to 42939 share no factor with it.
- 4
The digits of 42939 add up to 27, and repeating that until one digit is left gives the digital root 9. The Collatz sequence (halve if even, else 3n+1) takes 88 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42939 = 3^{2} \times 13 \times 367 \]42939 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 12 |
| Sum of divisors | 66976 |
| Euler totient φ(n) | 26352 |
| Square | 1843757721 |
| Cube | 79169112782019 |
| Square root | 207.217277 (= 3√4771) |
| Digit sum / digital root | 27 / 9 |
| Collatz steps to 1 | 88 |
| Scientific notation | 4.2939 × |
42939 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand nine hundred and thirty-nine |
| Binary (base 2) | 1010011110111011 |
| Octal (base 8) | 123673 |
| Hexadecimal (base 16) | A7BB |
| Base 3 | 2011220100 |
| As time | 42939 seconds = 11 h 55 min 39 s |
Is 42939 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 (42939 ÷ 3 = 14313) | 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 1) | 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 3) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | Yes (42939 ÷ 9 = 4771) | 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 6) | 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 42939 a prime number?
No. 42939 = × 13 × 367, so it is divisible by 3.
What are the factors of 42939?
1, 3, 9, 13, 39, 117, 367, 1101, 3303, 4771, 14313, 42939.
What is 42939 in binary?
1010011110111011 (hexadecimal A7BB, octal 123673).
What is the square root of 42939?
About 207.2173, exactly 3√4771.
Is 42939 divisible by 3?
Yes. Its digits add up to 27, a multiple of 3.
What is special about the number 42939?
It is a composite number with 12 divisors.