The number 18118
18118 is a composite number with 4 divisors. Its prime factorisation is 2 × 9059. Divisors (4): 1, 2, 9059, 18118.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 18118: a semiprime: 2 × 9059, the product of two primes.
- 2
18118 is composite. Its prime factorisation is
- 3
The divisors add up to 27180; without 18118 itself that is 9062, so 18118 is deficient (9062 is less than 18118). Euler's totient φ(18118) = 9058 numbers up to 18118 share no factor with it.
- 4
The digits of 18118 add up to 19, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 66 steps to reach 1.
LaTeX source of the formulas on this page
\[ 18118 = 2 \times 9059 \]
18118 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 27180 |
| Euler totient φ(n) | 9058 |
| Square | 328261924 |
| Cube | 5947449539032 |
| Square root | 134.603120 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 66 |
| Scientific notation | 1.8118 × |
18118 in other forms
| Form | Value |
|---|---|
| In words | eighteen thousand one hundred and eighteen |
| Binary (base 2) | 100011011000110 |
| Octal (base 8) | 43306 |
| Hexadecimal (base 16) | 46C6 |
| Base 3 | 220212001 |
| As time | 18118 seconds = 5 h 1 min 58 s |
Is 18118 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (18118 ÷ 2 = 9059) | 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 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 6) | 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 1) | 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 18118 a prime number?
No. 18118 = 2 × 9059, so it is divisible by 2.
What are the factors of 18118?
1, 2, 9059, 18118.
What is 18118 in binary?
100011011000110 (hexadecimal 46C6, octal 43306).
What is the square root of 18118?
About 134.6031.
Is 18118 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 18118?
18118 is a semiprime: 2 × 9059, the product of two primes.