The number 18918
18918 is a composite number with 12 divisors. Its prime factorisation is 2 × × 1051. Divisors (12): 1, 2, 3, 6, 9, 18, 1051, 2102, 3153, 6306, 9459, 18918.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
18918 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
18918 is composite. Its prime factorisation is
- 3
The divisors add up to 41028; without 18918 itself that is 22110, so 18918 is abundant (22110 is more than 18918). Euler's totient φ(18918) = 6300 numbers up to 18918 share no factor with it.
- 4
The digits of 18918 add up to 27, and repeating that until one digit is left gives the digital root 9. The Collatz sequence (halve if even, else 3n+1) takes 61 steps to reach 1.
LaTeX source of the formulas on this page
\[ 18918 = 2 \times 3^{2} \times 1051 \]18918 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 12 |
| Sum of divisors | 41028 |
| Euler totient φ(n) | 6300 |
| Square | 357890724 |
| Cube | 6770576716632 |
| Square root | 137.542721 (= 3√2102) |
| Digit sum / digital root | 27 / 9 |
| Collatz steps to 1 | 61 |
| Scientific notation | 1.8918 × |
18918 in other forms
| Form | Value |
|---|---|
| In words | eighteen thousand nine hundred and eighteen |
| Binary (base 2) | 100100111100110 |
| Octal (base 8) | 44746 |
| Hexadecimal (base 16) | 49E6 |
| Base 3 | 221221200 |
| As time | 18918 seconds = 5 h 15 min 18 s |
Is 18918 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (18918 ÷ 2 = 9459) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | Yes (18918 ÷ 3 = 6306) | 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 | Yes (18918 ÷ 6 = 3153) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 4) | 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 6) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | Yes (18918 ÷ 9 = 2102) | 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 | No (remainder 9) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 6) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 18918 a prime number?
No. 18918 = 2 × × 1051, so it is divisible by 2.
What are the factors of 18918?
1, 2, 3, 6, 9, 18, 1051, 2102, 3153, 6306, 9459, 18918.
What is 18918 in binary?
100100111100110 (hexadecimal 49E6, octal 44746).
What is the square root of 18918?
About 137.5427, exactly 3√2102.
Is 18918 divisible by 3?
Yes. Its digits add up to 27, a multiple of 3.
What is special about the number 18918?
It is a composite number with 12 divisors.