The number 42186
42186 is a composite number with 16 divisors. Its prime factorisation is 2 × 3 × 79 × 89. Divisors (16): 1, 2, 3, 6, 79, 89, 158, 178, 237, 267, 474, 534, 7031, 14062, 21093, 42186.
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How to work it out
- 1
42186 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
42186 is composite. Its prime factorisation is
- 3
The divisors add up to 86400; without 42186 itself that is 44214, so 42186 is abundant (44214 is more than 42186). Euler's totient φ(42186) = 13728 numbers up to 42186 share no factor with it.
- 4
The digits of 42186 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 150 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42186 = 2 \times 3 \times 79 \times 89 \]
42186 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 86400 |
| Euler totient φ(n) | 13728 |
| Square | 1779658596 |
| Cube | 75076677530856 |
| Square root | 205.392308 |
| Digit sum / digital root | 21 / 3 |
| Collatz steps to 1 | 150 |
| Scientific notation | 4.2186 × |
42186 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand one hundred and eighty-six |
| Binary (base 2) | 1010010011001010 |
| Octal (base 8) | 122312 |
| Hexadecimal (base 16) | A4CA |
| Base 3 | 2010212110 |
| As time | 42186 seconds = 11 h 43 min 6 s |
Is 42186 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (42186 ÷ 2 = 21093) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | Yes (42186 ÷ 3 = 14062) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 1) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | Yes (42186 ÷ 6 = 7031) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 4) | 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 2) | 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 6) | 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 6) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42186 a prime number?
No. 42186 = 2 × 3 × 79 × 89, so it is divisible by 2.
What are the factors of 42186?
1, 2, 3, 6, 79, 89, 158, 178, 237, 267, 474, 534, 7031, 14062, 21093, 42186.
What is 42186 in binary?
1010010011001010 (hexadecimal A4CA, octal 122312).
What is the square root of 42186?
About 205.3923.
Is 42186 divisible by 3?
Yes. Its digits add up to 21, a multiple of 3.
What is special about the number 42186?
It is a composite number with 16 divisors.