The number 42855
42855 is a composite number with 8 divisors. Its prime factorisation is 3 × 5 × 2857. Divisors (8): 1, 3, 5, 15, 2857, 8571, 14285, 42855.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
42855 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
42855 is composite. Its prime factorisation is
- 3
The divisors add up to 68592; without 42855 itself that is 25737, so 42855 is deficient (25737 is less than 42855). Euler's totient φ(42855) = 22848 numbers up to 42855 share no factor with it.
- 4
The digits of 42855 add up to 24, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 194 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42855 = 3 \times 5 \times 2857 \]
42855 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 68592 |
| Euler totient φ(n) | 22848 |
| Square | 1836551025 |
| Cube | 78705394176375 |
| Square root | 207.014492 |
| Digit sum / digital root | 24 / 6 |
| Collatz steps to 1 | 194 |
| Scientific notation | 4.2855 × |
42855 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand eight hundred and fifty-five |
| Binary (base 2) | 1010011101100111 |
| Octal (base 8) | 123547 |
| Hexadecimal (base 16) | A767 |
| Base 3 | 2011210020 |
| As time | 42855 seconds = 11 h 54 min 15 s |
Is 42855 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 (42855 ÷ 3 = 14285) | 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 (42855 ÷ 5 = 8571) | 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 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 6) | 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 10) | 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 42855 a prime number?
No. 42855 = 3 × 5 × 2857, so it is divisible by 3.
What are the factors of 42855?
1, 3, 5, 15, 2857, 8571, 14285, 42855.
What is 42855 in binary?
1010011101100111 (hexadecimal A767, octal 123547).
What is the square root of 42855?
About 207.0145.
Is 42855 divisible by 3?
Yes. Its digits add up to 24, a multiple of 3.
What is special about the number 42855?
It is a composite number with 8 divisors.