The number 18999
18999 is a composite number with 6 divisors. Its prime factorisation is × 2111. Divisors (6): 1, 3, 9, 2111, 6333, 18999.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
18999 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
18999 is composite. Its prime factorisation is
- 3
The divisors add up to 27456; without 18999 itself that is 8457, so 18999 is deficient (8457 is less than 18999). Euler's totient φ(18999) = 12660 numbers up to 18999 share no factor with it.
- 4
The digits of 18999 add up to 36, and repeating that until one digit is left gives the digital root 9. The Collatz sequence (halve if even, else 3n+1) takes 105 steps to reach 1.
LaTeX source of the formulas on this page
\[ 18999 = 3^{2} \times 2111 \]18999 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 6 |
| Sum of divisors | 27456 |
| Euler totient φ(n) | 12660 |
| Square | 360962001 |
| Cube | 6857917056999 |
| Square root | 137.836860 (= 3√2111) |
| Digit sum / digital root | 36 / 9 |
| Collatz steps to 1 | 105 |
| Scientific notation | 1.8999 × |
18999 in other forms
| Form | Value |
|---|---|
| In words | eighteen thousand nine hundred and ninety-nine |
| Binary (base 2) | 100101000110111 |
| Octal (base 8) | 45067 |
| Hexadecimal (base 16) | 4A37 |
| Base 3 | 222001200 |
| As time | 18999 seconds = 5 h 16 min 39 s |
Is 18999 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 | Yes (18999 ÷ 3 = 6333) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 3) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 4) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 3) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 1) | 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 7) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | Yes (18999 ÷ 9 = 2111) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 9) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 2) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 3) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 18999 a prime number?
No. 18999 = × 2111, so it is divisible by 3.
What are the factors of 18999?
1, 3, 9, 2111, 6333, 18999.
What is 18999 in binary?
100101000110111 (hexadecimal 4A37, octal 45067).
What is the square root of 18999?
About 137.8369, exactly 3√2111.
Is 18999 divisible by 3?
Yes. Its digits add up to 36, a multiple of 3.
What is special about the number 18999?
It is a composite number with 6 divisors.