The number 42739
42739 is a composite number with 4 divisors. Its prime factorisation is 79 × 541. Divisors (4): 1, 79, 541, 42739.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42739: a semiprime: 79 × 541, the product of two primes.
- 2
42739 is composite. Its prime factorisation is
- 3
The divisors add up to 43360; without 42739 itself that is 621, so 42739 is deficient (621 is less than 42739). Euler's totient φ(42739) = 42120 numbers up to 42739 share no factor with it.
- 4
The digits of 42739 add up to 25, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 101 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42739 = 79 \times 541 \]
42739 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 43360 |
| Euler totient φ(n) | 42120 |
| Square | 1826622121 |
| Cube | 78068002829419 |
| Square root | 206.734129 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 101 |
| Scientific notation | 4.2739 × |
42739 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand seven hundred and thirty-nine |
| Binary (base 2) | 1010011011110011 |
| Octal (base 8) | 123363 |
| Hexadecimal (base 16) | A6F3 |
| Base 3 | 2011121221 |
| As time | 42739 seconds = 11 h 52 min 19 s |
Is 42739 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 | No (remainder 1) | 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 1) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 4) | 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 | No (remainder 7) | 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 4) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42739 a prime number?
No. 42739 = 79 × 541, so it is divisible by 79.
What are the factors of 42739?
1, 79, 541, 42739.
What is 42739 in binary?
1010011011110011 (hexadecimal A6F3, octal 123363).
What is the square root of 42739?
About 206.7341.
Is 42739 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 42739?
42739 is a semiprime: 79 × 541, the product of two primes.