The number 42879
42879 is a composite number with 4 divisors. Its prime factorisation is 3 × 14293. Divisors (4): 1, 3, 14293, 42879.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42879: a semiprime: 3 × 14293, the product of two primes.
- 2
42879 is composite. Its prime factorisation is
- 3
The divisors add up to 57176; without 42879 itself that is 14297, so 42879 is deficient (14297 is less than 42879). Euler's totient φ(42879) = 28584 numbers up to 42879 share no factor with it.
- 4
The digits of 42879 add up to 30, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 75 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42879 = 3 \times 14293 \]
42879 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 57176 |
| Euler totient φ(n) | 28584 |
| Square | 1838608641 |
| Cube | 78837699917439 |
| Square root | 207.072451 |
| Digit sum / digital root | 30 / 3 |
| Collatz steps to 1 | 75 |
| Scientific notation | 4.2879 × |
42879 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand eight hundred and seventy-nine |
| Binary (base 2) | 1010011101111111 |
| Octal (base 8) | 123577 |
| Hexadecimal (base 16) | A77F |
| Base 3 | 2011211010 |
| As time | 42879 seconds = 11 h 54 min 39 s |
Is 42879 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 (42879 ÷ 3 = 14293) | 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 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 7) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 3) | 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 1) | 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 42879 a prime number?
No. 42879 = 3 × 14293, so it is divisible by 3.
What are the factors of 42879?
1, 3, 14293, 42879.
What is 42879 in binary?
1010011101111111 (hexadecimal A77F, octal 123577).
What is the square root of 42879?
About 207.0725.
Is 42879 divisible by 3?
Yes. Its digits add up to 30, a multiple of 3.
What is special about the number 42879?
42879 is a semiprime: 3 × 14293, the product of two primes.