The number 18388
18388 is a composite number with 6 divisors. Its prime factorisation is × 4597. Divisors (6): 1, 2, 4, 4597, 9194, 18388.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
18388 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
18388 is composite. Its prime factorisation is
- 3
The divisors add up to 32186; without 18388 itself that is 13798, so 18388 is deficient (13798 is less than 18388). Euler's totient φ(18388) = 9192 numbers up to 18388 share no factor with it.
- 4
The digits of 18388 add up to 28, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 48 steps to reach 1.
LaTeX source of the formulas on this page
\[ 18388 = 2^{2} \times 4597 \]18388 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 6 |
| Sum of divisors | 32186 |
| Euler totient φ(n) | 9192 |
| Square | 338118544 |
| Cube | 6217323787072 |
| Square root | 135.602360 (= 2√4597) |
| Digit sum / digital root | 28 / 1 |
| Collatz steps to 1 | 48 |
| Scientific notation | 1.8388 × |
18388 in other forms
| Form | Value |
|---|---|
| In words | eighteen thousand three hundred and eighty-eight |
| Binary (base 2) | 100011111010100 |
| Octal (base 8) | 43724 |
| Hexadecimal (base 16) | 47D4 |
| Base 3 | 221020001 |
| As time | 18388 seconds = 5 h 6 min 28 s |
Is 18388 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (18388 ÷ 2 = 9194) | 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 | Yes (18388 ÷ 4 = 4597) | 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 4) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 1) | 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 7) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 4) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 18388 a prime number?
No. 18388 = × 4597, so it is divisible by 2.
What are the factors of 18388?
1, 2, 4, 4597, 9194, 18388.
What is 18388 in binary?
100011111010100 (hexadecimal 47D4, octal 43724).
What is the square root of 18388?
About 135.6024, exactly 2√4597.
Is 18388 divisible by 3?
No. Its digits add up to 28, which is not a multiple of 3.
What is special about the number 18388?
It is a composite number with 6 divisors.