The number 42065
42065 is a composite number with 8 divisors. Its prime factorisation is 5 × 47 × 179. Divisors (8): 1, 5, 47, 179, 235, 895, 8413, 42065.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
42065 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
42065 is composite. Its prime factorisation is
- 3
The divisors add up to 51840; without 42065 itself that is 9775, so 42065 is deficient (9775 is less than 42065). Euler's totient φ(42065) = 32752 numbers up to 42065 share no factor with it.
- 4
The digits of 42065 add up to 17, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 181 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42065 = 5 \times 47 \times 179 \]
42065 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 51840 |
| Euler totient φ(n) | 32752 |
| Square | 1769464225 |
| Cube | 74432512624625 |
| Square root | 205.097538 |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 181 |
| Scientific notation | 4.2065 × |
42065 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand and sixty-five |
| Binary (base 2) | 1010010001010001 |
| Octal (base 8) | 122121 |
| Hexadecimal (base 16) | A451 |
| Base 3 | 2010200222 |
| As time | 42065 seconds = 11 h 41 min 5 s |
Is 42065 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 1) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (42065 ÷ 5 = 8413) | 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 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 1) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 8) | 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 1) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42065 a prime number?
No. 42065 = 5 × 47 × 179, so it is divisible by 5.
What are the factors of 42065?
1, 5, 47, 179, 235, 895, 8413, 42065.
What is 42065 in binary?
1010010001010001 (hexadecimal A451, octal 122121).
What is the square root of 42065?
About 205.0975.
Is 42065 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 42065?
It is a composite number with 8 divisors.