The number 18188
18188 is a composite number with 6 divisors. Its prime factorisation is × 4547. Divisors (6): 1, 2, 4, 4547, 9094, 18188.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
18188 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
18188 is composite. Its prime factorisation is
- 3
The divisors add up to 31836; without 18188 itself that is 13648, so 18188 is deficient (13648 is less than 18188). Euler's totient φ(18188) = 9092 numbers up to 18188 share no factor with it.
- 4
The digits of 18188 add up to 26, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 141 steps to reach 1.
LaTeX source of the formulas on this page
\[ 18188 = 2^{2} \times 4547 \]18188 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 6 |
| Sum of divisors | 31836 |
| Euler totient φ(n) | 9092 |
| Square | 330803344 |
| Cube | 6016651220672 |
| Square root | 134.862893 (= 2√4547) |
| Digit sum / digital root | 26 / 8 |
| Collatz steps to 1 | 141 |
| Scientific notation | 1.8188 × |
18188 in other forms
| Form | Value |
|---|---|
| In words | eighteen thousand one hundred and eighty-eight |
| Binary (base 2) | 100011100001100 |
| Octal (base 8) | 43414 |
| Hexadecimal (base 16) | 470C |
| Base 3 | 220221122 |
| As time | 18188 seconds = 5 h 3 min 8 s |
Is 18188 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (18188 ÷ 2 = 9094) | 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 | Yes (18188 ÷ 4 = 4547) | 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 2) | 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 4) | 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 8) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 5) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 8) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 18188 a prime number?
No. 18188 = × 4547, so it is divisible by 2.
What are the factors of 18188?
1, 2, 4, 4547, 9094, 18188.
What is 18188 in binary?
100011100001100 (hexadecimal 470C, octal 43414).
What is the square root of 18188?
About 134.8629, exactly 2√4547.
Is 18188 divisible by 3?
No. Its digits add up to 26, which is not a multiple of 3.
What is special about the number 18188?
It is a composite number with 6 divisors.