The number 42887
42887 is a composite number with 4 divisors. Its prime factorisation is 13 × 3299. Divisors (4): 1, 13, 3299, 42887.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42887: a semiprime: 13 × 3299, the product of two primes.
- 2
42887 is composite. Its prime factorisation is
- 3
The divisors add up to 46200; without 42887 itself that is 3313, so 42887 is deficient (3313 is less than 42887). Euler's totient φ(42887) = 39576 numbers up to 42887 share no factor with it.
- 4
The digits of 42887 add up to 29, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 101 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42887 = 13 \times 3299 \]
42887 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 46200 |
| Euler totient φ(n) | 39576 |
| Square | 1839294769 |
| Cube | 78881834758103 |
| Square root | 207.091767 |
| Digit sum / digital root | 29 / 2 |
| Collatz steps to 1 | 101 |
| Scientific notation | 4.2887 × |
42887 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand eight hundred and eighty-seven |
| Binary (base 2) | 1010011110000111 |
| Octal (base 8) | 123607 |
| Hexadecimal (base 16) | A787 |
| Base 3 | 2011211102 |
| As time | 42887 seconds = 11 h 54 min 47 s |
Is 42887 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 2) | 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 5) | 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 2) | 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 9) | 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 42887 a prime number?
No. 42887 = 13 × 3299, so it is divisible by 13.
What are the factors of 42887?
1, 13, 3299, 42887.
What is 42887 in binary?
1010011110000111 (hexadecimal A787, octal 123607).
What is the square root of 42887?
About 207.0918.
Is 42887 divisible by 3?
No. Its digits add up to 29, which is not a multiple of 3.
What is special about the number 42887?
42887 is a semiprime: 13 × 3299, the product of two primes.