The number 42555
42555 is a composite number with 8 divisors. Its prime factorisation is 3 × 5 × 2837. Divisors (8): 1, 3, 5, 15, 2837, 8511, 14185, 42555.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
42555 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
42555 is composite. Its prime factorisation is
- 3
The divisors add up to 68112; without 42555 itself that is 25557, so 42555 is deficient (25557 is less than 42555). Euler's totient φ(42555) = 22688 numbers up to 42555 share no factor with it.
- 4
The digits of 42555 add up to 21, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 101 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42555 = 3 \times 5 \times 2837 \]
42555 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 68112 |
| Euler totient φ(n) | 22688 |
| Square | 1810928025 |
| Cube | 77064042103875 |
| Square root | 206.288633 |
| Digit sum / digital root | 21 / 3 |
| Collatz steps to 1 | 101 |
| Scientific notation | 4.2555 × |
42555 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand five hundred and fifty-five |
| Binary (base 2) | 1010011000111011 |
| Octal (base 8) | 123073 |
| Hexadecimal (base 16) | A63B |
| Base 3 | 2011101010 |
| As time | 42555 seconds = 11 h 49 min 15 s |
Is 42555 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 (42555 ÷ 3 = 14185) | 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 | Yes (42555 ÷ 5 = 8511) | 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 2) | 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 3) | 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 5) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 7) | 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 42555 a prime number?
No. 42555 = 3 × 5 × 2837, so it is divisible by 3.
What are the factors of 42555?
1, 3, 5, 15, 2837, 8511, 14185, 42555.
What is 42555 in binary?
1010011000111011 (hexadecimal A63B, octal 123073).
What is the square root of 42555?
About 206.2886.
Is 42555 divisible by 3?
Yes. Its digits add up to 21, a multiple of 3.
What is special about the number 42555?
It is a composite number with 8 divisors.