The number 18938
18938 is a composite number with 8 divisors. Its prime factorisation is 2 × 17 × 557. Divisors (8): 1, 2, 17, 34, 557, 1114, 9469, 18938.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 18938: a happy number: repeatedly adding the squares of its digits reaches 1.
- 2
18938 is composite. Its prime factorisation is
- 3
The divisors add up to 30132; without 18938 itself that is 11194, so 18938 is deficient (11194 is less than 18938). Euler's totient φ(18938) = 8896 numbers up to 18938 share no factor with it.
- 4
The digits of 18938 add up to 29, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 92 steps to reach 1.
LaTeX source of the formulas on this page
\[ 18938 = 2 \times 17 \times 557 \]
18938 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 30132 |
| Euler totient φ(n) | 8896 |
| Square | 358647844 |
| Cube | 6792072869672 |
| Square root | 137.615406 |
| Digit sum / digital root | 29 / 2 |
| Collatz steps to 1 | 92 |
| Scientific notation | 1.8938 × |
18938 in other forms
| Form | Value |
|---|---|
| In words | eighteen thousand nine hundred and thirty-eight |
| Binary (base 2) | 100100111111010 |
| Octal (base 8) | 44772 |
| Hexadecimal (base 16) | 49FA |
| Base 3 | 221222102 |
| As time | 18938 seconds = 5 h 15 min 38 s |
Is 18938 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (18938 ÷ 2 = 9469) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 2) | 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 2) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 3) | 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 2) | 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 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 18938 a prime number?
No. 18938 = 2 × 17 × 557, so it is divisible by 2.
What are the factors of 18938?
1, 2, 17, 34, 557, 1114, 9469, 18938.
What is 18938 in binary?
100100111111010 (hexadecimal 49FA, octal 44772).
What is the square root of 18938?
About 137.6154.
Is 18938 divisible by 3?
No. Its digits add up to 29, which is not a multiple of 3.
What is special about the number 18938?
18938 is a happy number: repeatedly adding the squares of its digits reaches 1.