The number 39842
39842 is a composite number with 8 divisors. Its prime factorisation is 2 × 11 × 1811. Divisors (8): 1, 2, 11, 22, 1811, 3622, 19921, 39842.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
39842 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
39842 is composite. Its prime factorisation is
- 3
The divisors add up to 65232; without 39842 itself that is 25390, so 39842 is deficient (25390 is less than 39842). Euler's totient φ(39842) = 18100 numbers up to 39842 share no factor with it.
- 4
The digits of 39842 add up to 26, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 44 steps to reach 1.
LaTeX source of the formulas on this page
\[ 39842 = 2 \times 11 \times 1811 \]
39842 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 65232 |
| Euler totient φ(n) | 18100 |
| Square | 1587384964 |
| Cube | 63244591735688 |
| Square root | 199.604609 |
| Digit sum / digital root | 26 / 8 |
| Collatz steps to 1 | 44 |
| Scientific notation | 3.9842 × |
39842 in other forms
| Form | Value |
|---|---|
| In words | thirty-nine thousand eight hundred and forty-two |
| Binary (base 2) | 1001101110100010 |
| Octal (base 8) | 115642 |
| Hexadecimal (base 16) | 9BA2 |
| Base 3 | 2000122122 |
| As time | 39842 seconds = 11 h 4 min 2 s |
Is 39842 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (39842 ÷ 2 = 19921) | 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 5) | 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 8) | 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 | Yes (39842 ÷ 11 = 3622) | 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 39842 a prime number?
No. 39842 = 2 × 11 × 1811, so it is divisible by 2.
What are the factors of 39842?
1, 2, 11, 22, 1811, 3622, 19921, 39842.
What is 39842 in binary?
1001101110100010 (hexadecimal 9BA2, octal 115642).
What is the square root of 39842?
About 199.6046.
Is 39842 divisible by 3?
No. Its digits add up to 26, which is not a multiple of 3.
What is special about the number 39842?
It is a composite number with 8 divisors.