The number 42158
42158 is a composite number with 8 divisors. Its prime factorisation is 2 × 107 × 197. Divisors (8): 1, 2, 107, 197, 214, 394, 21079, 42158.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
42158 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
42158 is composite. Its prime factorisation is
- 3
The divisors add up to 64152; without 42158 itself that is 21994, so 42158 is deficient (21994 is less than 42158). Euler's totient φ(42158) = 20776 numbers up to 42158 share no factor with it.
- 4
The digits of 42158 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 194 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42158 = 2 \times 107 \times 197 \]
42158 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 64152 |
| Euler totient φ(n) | 20776 |
| Square | 1777296964 |
| Cube | 74927285408312 |
| Square root | 205.324134 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 194 |
| Scientific notation | 4.2158 × |
42158 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand one hundred and fifty-eight |
| Binary (base 2) | 1010010010101110 |
| Octal (base 8) | 122256 |
| Hexadecimal (base 16) | A4AE |
| Base 3 | 2010211102 |
| As time | 42158 seconds = 11 h 42 min 38 s |
Is 42158 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (42158 ÷ 2 = 21079) | 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 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 3) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 2) | 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 6) | 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 8) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 6) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42158 a prime number?
No. 42158 = 2 × 107 × 197, so it is divisible by 2.
What are the factors of 42158?
1, 2, 107, 197, 214, 394, 21079, 42158.
What is 42158 in binary?
1010010010101110 (hexadecimal A4AE, octal 122256).
What is the square root of 42158?
About 205.3241.
Is 42158 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 42158?
It is a composite number with 8 divisors.