The number 42185
42185 is a composite number with 16 divisors. Its prime factorisation is 5 × 11 × 13 × 59. Divisors (16): 1, 5, 11, 13, 55, 59, 65, 143, 295, 649, 715, 767, 3245, 3835, 8437, 42185.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
42185 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
42185 is composite. Its prime factorisation is
- 3
The divisors add up to 60480; without 42185 itself that is 18295, so 42185 is deficient (18295 is less than 42185). Euler's totient φ(42185) = 27840 numbers up to 42185 share no factor with it.
- 4
The digits of 42185 add up to 20, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 80 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42185 = 5 \times 11 \times 13 \times 59 \]
42185 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 60480 |
| Euler totient φ(n) | 27840 |
| Square | 1779574225 |
| Cube | 75071338681625 |
| Square root | 205.389873 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 80 |
| Scientific notation | 4.2185 × |
42185 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand one hundred and eighty-five |
| Binary (base 2) | 1010010011001001 |
| Octal (base 8) | 122311 |
| Hexadecimal (base 16) | A4C9 |
| Base 3 | 2010212102 |
| As time | 42185 seconds = 11 h 43 min 5 s |
Is 42185 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 (42185 ÷ 5 = 8437) | 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 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 1) | 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 5) | A number is divisible by 10 if the last digit is 0. |
| 11 | Yes (42185 ÷ 11 = 3835) | 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 42185 a prime number?
No. 42185 = 5 × 11 × 13 × 59, so it is divisible by 5.
What are the factors of 42185?
1, 5, 11, 13, 55, 59, 65, 143, 295, 649, 715, 767, 3245, 3835, 8437, 42185.
What is 42185 in binary?
1010010011001001 (hexadecimal A4C9, octal 122311).
What is the square root of 42185?
About 205.3899.
Is 42185 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 42185?
It is a composite number with 16 divisors.