The number 39985
39985 is a composite number with 8 divisors. Its prime factorisation is 5 × 11 × 727. Divisors (8): 1, 5, 11, 55, 727, 3635, 7997, 39985.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
39985 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
39985 is composite. Its prime factorisation is
- 3
The divisors add up to 52416; without 39985 itself that is 12431, so 39985 is deficient (12431 is less than 39985). Euler's totient φ(39985) = 29040 numbers up to 39985 share no factor with it.
- 4
The digits of 39985 add up to 34, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 67 steps to reach 1.
LaTeX source of the formulas on this page
\[ 39985 = 5 \times 11 \times 727 \]
39985 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 52416 |
| Euler totient φ(n) | 29040 |
| Square | 1598800225 |
| Cube | 63928026996625 |
| Square root | 199.962496 |
| Digit sum / digital root | 34 / 7 |
| Collatz steps to 1 | 67 |
| Scientific notation | 3.9985 × |
39985 in other forms
| Form | Value |
|---|---|
| In words | thirty-nine thousand nine hundred and eighty-five |
| Binary (base 2) | 1001110000110001 |
| Octal (base 8) | 116061 |
| Hexadecimal (base 16) | 9C31 |
| Base 3 | 2000211221 |
| As time | 39985 seconds = 11 h 6 min 25 s |
Is 39985 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 1) | 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 (39985 ÷ 5 = 7997) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 1) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 1) | 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 7) | 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 (39985 ÷ 11 = 3635) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 39985 a prime number?
No. 39985 = 5 × 11 × 727, so it is divisible by 5.
What are the factors of 39985?
1, 5, 11, 55, 727, 3635, 7997, 39985.
What is 39985 in binary?
1001110000110001 (hexadecimal 9C31, octal 116061).
What is the square root of 39985?
About 199.9625.
Is 39985 divisible by 3?
No. Its digits add up to 34, which is not a multiple of 3.
What is special about the number 39985?
It is a composite number with 8 divisors.