The number 40018
40018 is a composite number with 16 divisors. Its prime factorisation is 2 × 11 × 17 × 107. Divisors (16): 1, 2, 11, 17, 22, 34, 107, 187, 214, 374, 1177, 1819, 2354, 3638, 20009, 40018.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
40018 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
40018 is composite. Its prime factorisation is
- 3
The divisors add up to 69984; without 40018 itself that is 29966, so 40018 is deficient (29966 is less than 40018). Euler's totient φ(40018) = 16960 numbers up to 40018 share no factor with it.
- 4
The digits of 40018 add up to 13, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 168 steps to reach 1.
LaTeX source of the formulas on this page
\[ 40018 = 2 \times 11 \times 17 \times 107 \]
40018 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 69984 |
| Euler totient φ(n) | 16960 |
| Square | 1601440324 |
| Cube | 64086438885832 |
| Square root | 200.044995 |
| Digit sum / digital root | 13 / 4 |
| Collatz steps to 1 | 168 |
| Scientific notation | 4.0018 × |
40018 in other forms
| Form | Value |
|---|---|
| In words | forty thousand and eighteen |
| Binary (base 2) | 1001110001010010 |
| Octal (base 8) | 116122 |
| Hexadecimal (base 16) | 9C52 |
| Base 3 | 2000220011 |
| As time | 40018 seconds = 11 h 6 min 58 s |
Is 40018 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (40018 ÷ 2 = 20009) | 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 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 3) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 4) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 6) | 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 4) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 8) | A number is divisible by 10 if the last digit is 0. |
| 11 | Yes (40018 ÷ 11 = 3638) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 40018 a prime number?
No. 40018 = 2 × 11 × 17 × 107, so it is divisible by 2.
What are the factors of 40018?
1, 2, 11, 17, 22, 34, 107, 187, 214, 374, 1177, 1819, 2354, 3638, 20009, 40018.
What is 40018 in binary?
1001110001010010 (hexadecimal 9C52, octal 116122).
What is the square root of 40018?
About 200.0450.
Is 40018 divisible by 3?
No. Its digits add up to 13, which is not a multiple of 3.
What is special about the number 40018?
It is a composite number with 16 divisors.