The number 42127
42127 is a composite number with 4 divisors. Its prime factorisation is 103 × 409. Divisors (4): 1, 103, 409, 42127.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42127: a semiprime: 103 × 409, the product of two primes.
- 2
42127 is composite. Its prime factorisation is
- 3
The divisors add up to 42640; without 42127 itself that is 513, so 42127 is deficient (513 is less than 42127). Euler's totient φ(42127) = 41616 numbers up to 42127 share no factor with it.
- 4
The digits of 42127 add up to 16, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 194 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42127 = 103 \times 409 \]
42127 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 42640 |
| Euler totient φ(n) | 41616 |
| Square | 1774684129 |
| Cube | 74762118302383 |
| Square root | 205.248630 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 194 |
| Scientific notation | 4.2127 × |
42127 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand one hundred and twenty-seven |
| Binary (base 2) | 1010010010001111 |
| Octal (base 8) | 122217 |
| Hexadecimal (base 16) | A48F |
| Base 3 | 2010210021 |
| As time | 42127 seconds = 11 h 42 min 7 s |
Is 42127 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 2) | 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 1) | 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 7) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 7) | 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 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42127 a prime number?
No. 42127 = 103 × 409, so it is divisible by 103.
What are the factors of 42127?
1, 103, 409, 42127.
What is 42127 in binary?
1010010010001111 (hexadecimal A48F, octal 122217).
What is the square root of 42127?
About 205.2486.
Is 42127 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 42127?
42127 is a semiprime: 103 × 409, the product of two primes.