The number 40385
40385 is a composite number with 8 divisors. Its prime factorisation is 5 × 41 × 197. Divisors (8): 1, 5, 41, 197, 205, 985, 8077, 40385.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
40385 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
40385 is composite. Its prime factorisation is
- 3
The divisors add up to 49896; without 40385 itself that is 9511, so 40385 is deficient (9511 is less than 40385). Euler's totient φ(40385) = 31360 numbers up to 40385 share no factor with it.
- 4
The digits of 40385 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 168 steps to reach 1.
LaTeX source of the formulas on this page
\[ 40385 = 5 \times 41 \times 197 \]
40385 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 49896 |
| Euler totient φ(n) | 31360 |
| Square | 1630948225 |
| Cube | 65865844066625 |
| Square root | 200.960195 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 168 |
| Scientific notation | 4.0385 × |
40385 in other forms
| Form | Value |
|---|---|
| In words | forty thousand three hundred and eighty-five |
| Binary (base 2) | 1001110111000001 |
| Octal (base 8) | 116701 |
| Hexadecimal (base 16) | 9DC1 |
| Base 3 | 2001101202 |
| As time | 40385 seconds = 11 h 13 min 5 s |
Is 40385 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 2) | 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 (40385 ÷ 5 = 8077) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 5) | 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 1) | 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 5) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 4) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 40385 a prime number?
No. 40385 = 5 × 41 × 197, so it is divisible by 5.
What are the factors of 40385?
1, 5, 41, 197, 205, 985, 8077, 40385.
What is 40385 in binary?
1001110111000001 (hexadecimal 9DC1, octal 116701).
What is the square root of 40385?
About 200.9602.
Is 40385 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 40385?
It is a composite number with 8 divisors.