The number 42479
42479 is a composite number with 4 divisors. Its prime factorisation is 107 × 397. Divisors (4): 1, 107, 397, 42479.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42479: a semiprime: 107 × 397, the product of two primes.
- 2
42479 is composite. Its prime factorisation is
- 3
The divisors add up to 42984; without 42479 itself that is 505, so 42479 is deficient (505 is less than 42479). Euler's totient φ(42479) = 41976 numbers up to 42479 share no factor with it.
- 4
The digits of 42479 add up to 26, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 106 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42479 = 107 \times 397 \]
42479 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 42984 |
| Euler totient φ(n) | 41976 |
| Square | 1804465441 |
| Cube | 76651887468239 |
| Square root | 206.104343 |
| Digit sum / digital root | 26 / 8 |
| Collatz steps to 1 | 106 |
| Scientific notation | 4.2479 × |
42479 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand four hundred and seventy-nine |
| Binary (base 2) | 1010010111101111 |
| Octal (base 8) | 122757 |
| Hexadecimal (base 16) | A5EF |
| Base 3 | 2011021022 |
| As time | 42479 seconds = 11 h 47 min 59 s |
Is 42479 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 2) | 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 5) | 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 7) | 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 9) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 8) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 11) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42479 a prime number?
No. 42479 = 107 × 397, so it is divisible by 107.
What are the factors of 42479?
1, 107, 397, 42479.
What is 42479 in binary?
1010010111101111 (hexadecimal A5EF, octal 122757).
What is the square root of 42479?
About 206.1043.
Is 42479 divisible by 3?
No. Its digits add up to 26, which is not a multiple of 3.
What is special about the number 42479?
42479 is a semiprime: 107 × 397, the product of two primes.