The number 42871
42871 is a composite number with 4 divisors. Its prime factorisation is 43 × 997. Divisors (4): 1, 43, 997, 42871.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42871: a semiprime: 43 × 997, the product of two primes.
- 2
42871 is composite. Its prime factorisation is
- 3
The divisors add up to 43912; without 42871 itself that is 1041, so 42871 is deficient (1041 is less than 42871). Euler's totient φ(42871) = 41832 numbers up to 42871 share no factor with it.
- 4
The digits of 42871 add up to 22, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 194 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42871 = 43 \times 997 \]
42871 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 43912 |
| Euler totient φ(n) | 41832 |
| Square | 1837922641 |
| Cube | 78793581542311 |
| Square root | 207.053133 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 194 |
| Scientific notation | 4.2871 × |
42871 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand eight hundred and seventy-one |
| Binary (base 2) | 1010011101110111 |
| Octal (base 8) | 123567 |
| Hexadecimal (base 16) | A777 |
| Base 3 | 2011210211 |
| As time | 42871 seconds = 11 h 54 min 31 s |
Is 42871 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 1) | 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 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 4) | 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 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42871 a prime number?
No. 42871 = 43 × 997, so it is divisible by 43.
What are the factors of 42871?
1, 43, 997, 42871.
What is 42871 in binary?
1010011101110111 (hexadecimal A777, octal 123567).
What is the square root of 42871?
About 207.0531.
Is 42871 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 42871?
42871 is a semiprime: 43 × 997, the product of two primes.