The number 13918
13918 is a composite number with 4 divisors. Its prime factorisation is 2 × 6959. Divisors (4): 1, 2, 6959, 13918.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 13918: a semiprime: 2 × 6959, the product of two primes.
- 2
13918 is composite. Its prime factorisation is
- 3
The divisors add up to 20880; without 13918 itself that is 6962, so 13918 is deficient (6962 is less than 13918). Euler's totient φ(13918) = 6958 numbers up to 13918 share no factor with it.
- 4
The digits of 13918 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 89 steps to reach 1.
LaTeX source of the formulas on this page
\[ 13918 = 2 \times 6959 \]
13918 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 20880 |
| Euler totient φ(n) | 6958 |
| Square | 193710724 |
| Cube | 2696065856632 |
| Square root | 117.974574 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 89 |
| Scientific notation | 1.3918 × |
13918 in other forms
| Form | Value |
|---|---|
| In words | thirteen thousand nine hundred and eighteen |
| Binary (base 2) | 11011001011110 |
| Octal (base 8) | 33136 |
| Hexadecimal (base 16) | 365E |
| Base 3 | 201002111 |
| As time | 13918 seconds = 3 h 51 min 58 s |
Is 13918 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (13918 ÷ 2 = 6959) | 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 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 3) | 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 13918 a prime number?
No. 13918 = 2 × 6959, so it is divisible by 2.
What are the factors of 13918?
1, 2, 6959, 13918.
What is 13918 in binary?
11011001011110 (hexadecimal 365E, octal 33136).
What is the square root of 13918?
About 117.9746.
Is 13918 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 13918?
13918 is a semiprime: 2 × 6959, the product of two primes.