The number 40085
40085 is a composite number with 4 divisors. Its prime factorisation is 5 × 8017. Divisors (4): 1, 5, 8017, 40085.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 40085: a semiprime: 5 × 8017, the product of two primes.
- 2
40085 is composite. Its prime factorisation is
- 3
The divisors add up to 48108; without 40085 itself that is 8023, so 40085 is deficient (8023 is less than 40085). Euler's totient φ(40085) = 32064 numbers up to 40085 share no factor with it.
- 4
The digits of 40085 add up to 17, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 93 steps to reach 1.
LaTeX source of the formulas on this page
\[ 40085 = 5 \times 8017 \]
40085 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 48108 |
| Euler totient φ(n) | 32064 |
| Square | 1606807225 |
| Cube | 64408867614125 |
| Square root | 200.212387 |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 93 |
| Scientific notation | 4.0085 × |
40085 in other forms
| Form | Value |
|---|---|
| In words | forty thousand and eighty-five |
| Binary (base 2) | 1001110010010101 |
| Octal (base 8) | 116225 |
| Hexadecimal (base 16) | 9C95 |
| Base 3 | 2000222122 |
| As time | 40085 seconds = 11 h 8 min 5 s |
Is 40085 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 (40085 ÷ 5 = 8017) | 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 3) | 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 5) | 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 5) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 1) | 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 40085 a prime number?
No. 40085 = 5 × 8017, so it is divisible by 5.
What are the factors of 40085?
1, 5, 8017, 40085.
What is 40085 in binary?
1001110010010101 (hexadecimal 9C95, octal 116225).
What is the square root of 40085?
About 200.2124.
Is 40085 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 40085?
40085 is a semiprime: 5 × 8017, the product of two primes.