The number 42842
42842 is a composite number with 8 divisors. Its prime factorisation is 2 × 31 × 691. Divisors (8): 1, 2, 31, 62, 691, 1382, 21421, 42842.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
42842 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
42842 is composite. Its prime factorisation is
- 3
The divisors add up to 66432; without 42842 itself that is 23590, so 42842 is deficient (23590 is less than 42842). Euler's totient φ(42842) = 20700 numbers up to 42842 share no factor with it.
- 4
The digits of 42842 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 101 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42842 = 2 \times 31 \times 691 \]
42842 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 66432 |
| Euler totient φ(n) | 20700 |
| Square | 1835436964 |
| Cube | 78633790411688 |
| Square root | 206.983091 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 101 |
| Scientific notation | 4.2842 × |
42842 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand eight hundred and forty-two |
| Binary (base 2) | 1010011101011010 |
| Octal (base 8) | 123532 |
| Hexadecimal (base 16) | A75A |
| Base 3 | 2011202202 |
| As time | 42842 seconds = 11 h 54 min 2 s |
Is 42842 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (42842 ÷ 2 = 21421) | 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 2) | 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 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 2) | 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 2) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 8) | 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 42842 a prime number?
No. 42842 = 2 × 31 × 691, so it is divisible by 2.
What are the factors of 42842?
1, 2, 31, 62, 691, 1382, 21421, 42842.
What is 42842 in binary?
1010011101011010 (hexadecimal A75A, octal 123532).
What is the square root of 42842?
About 206.9831.
Is 42842 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 42842?
It is a composite number with 8 divisors.