The number 42431
42431 is a composite number with 4 divisors. Its prime factorisation is 151 × 281. Divisors (4): 1, 151, 281, 42431.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42431: a semiprime: 151 × 281, the product of two primes.
- 2
42431 is composite. Its prime factorisation is
- 3
The divisors add up to 42864; without 42431 itself that is 433, so 42431 is deficient (433 is less than 42431). Euler's totient φ(42431) = 42000 numbers up to 42431 share no factor with it.
- 4
The digits of 42431 add up to 14, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 225 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42431 = 151 \times 281 \]
42431 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 42864 |
| Euler totient φ(n) | 42000 |
| Square | 1800389761 |
| Cube | 76392337948991 |
| Square root | 205.987864 |
| Digit sum / digital root | 14 / 5 |
| Collatz steps to 1 | 225 |
| Scientific notation | 4.2431 × |
42431 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand four hundred and thirty-one |
| Binary (base 2) | 1010010110111111 |
| Octal (base 8) | 122677 |
| Hexadecimal (base 16) | A5BF |
| Base 3 | 2011012112 |
| As time | 42431 seconds = 11 h 47 min 11 s |
Is 42431 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 1) | 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 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 5) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 1) | 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 11) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42431 a prime number?
No. 42431 = 151 × 281, so it is divisible by 151.
What are the factors of 42431?
1, 151, 281, 42431.
What is 42431 in binary?
1010010110111111 (hexadecimal A5BF, octal 122677).
What is the square root of 42431?
About 205.9879.
Is 42431 divisible by 3?
No. Its digits add up to 14, which is not a multiple of 3.
What is special about the number 42431?
42431 is a semiprime: 151 × 281, the product of two primes.