The number 18418
18418 is a composite number with 4 divisors. Its prime factorisation is 2 × 9209. Divisors (4): 1, 2, 9209, 18418.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 18418: a semiprime: 2 × 9209, the product of two primes.
- 2
18418 is composite. Its prime factorisation is
- 3
The divisors add up to 27630; without 18418 itself that is 9212, so 18418 is deficient (9212 is less than 18418). Euler's totient φ(18418) = 9208 numbers up to 18418 share no factor with it.
- 4
The digits of 18418 add up to 22, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 123 steps to reach 1.
LaTeX source of the formulas on this page
\[ 18418 = 2 \times 9209 \]
18418 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 27630 |
| Euler totient φ(n) | 9208 |
| Square | 339222724 |
| Cube | 6247804130632 |
| Square root | 135.712932 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 123 |
| Scientific notation | 1.8418 × |
18418 in other forms
| Form | Value |
|---|---|
| In words | eighteen thousand four hundred and eighteen |
| Binary (base 2) | 100011111110010 |
| Octal (base 8) | 43762 |
| Hexadecimal (base 16) | 47F2 |
| Base 3 | 221021011 |
| As time | 18418 seconds = 5 h 6 min 58 s |
Is 18418 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (18418 ÷ 2 = 9209) | 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 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 2) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 4) | 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 4) | 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 18418 a prime number?
No. 18418 = 2 × 9209, so it is divisible by 2.
What are the factors of 18418?
1, 2, 9209, 18418.
What is 18418 in binary?
100011111110010 (hexadecimal 47F2, octal 43762).
What is the square root of 18418?
About 135.7129.
Is 18418 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 18418?
18418 is a semiprime: 2 × 9209, the product of two primes.