The number 42955
42955 is a composite number with 12 divisors. Its prime factorisation is 5 × × 71. Divisors (12): 1, 5, 11, 55, 71, 121, 355, 605, 781, 3905, 8591, 42955.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
42955 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
42955 is composite. Its prime factorisation is
- 3
The divisors add up to 57456; without 42955 itself that is 14501, so 42955 is deficient (14501 is less than 42955). Euler's totient φ(42955) = 30800 numbers up to 42955 share no factor with it.
- 4
The digits of 42955 add up to 25, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 75 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42955 = 5 \times 11^{2} \times 71 \]42955 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 12 |
| Sum of divisors | 57456 |
| Euler totient φ(n) | 30800 |
| Square | 1845132025 |
| Cube | 79257646133875 |
| Square root | 207.255880 (= 11√355) |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 75 |
| Scientific notation | 4.2955 × |
42955 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand nine hundred and fifty-five |
| Binary (base 2) | 1010011111001011 |
| Octal (base 8) | 123713 |
| Hexadecimal (base 16) | A7CB |
| Base 3 | 2011220221 |
| As time | 42955 seconds = 11 h 55 min 55 s |
Is 42955 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 | Yes (42955 ÷ 5 = 8591) | 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 3) | 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 5) | A number is divisible by 10 if the last digit is 0. |
| 11 | Yes (42955 ÷ 11 = 3905) | 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 42955 a prime number?
No. 42955 = 5 × × 71, so it is divisible by 5.
What are the factors of 42955?
1, 5, 11, 55, 71, 121, 355, 605, 781, 3905, 8591, 42955.
What is 42955 in binary?
1010011111001011 (hexadecimal A7CB, octal 123713).
What is the square root of 42955?
About 207.2559, exactly 11√355.
Is 42955 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 42955?
It is a composite number with 12 divisors.