The number 38918
38918 is a composite number with 16 divisors. Its prime factorisation is 2 × 11 × 29 × 61. Divisors (16): 1, 2, 11, 22, 29, 58, 61, 122, 319, 638, 671, 1342, 1769, 3538, 19459, 38918.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 38918: a happy number: repeatedly adding the squares of its digits reaches 1; a Harshad number: divisible by its digit sum 29.
- 2
38918 is composite. Its prime factorisation is
- 3
The divisors add up to 66960; without 38918 itself that is 28042, so 38918 is deficient (28042 is less than 38918). Euler's totient φ(38918) = 16800 numbers up to 38918 share no factor with it.
- 4
The digits of 38918 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 168 steps to reach 1.
LaTeX source of the formulas on this page
\[ 38918 = 2 \times 11 \times 29 \times 61 \]
38918 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 66960 |
| Euler totient φ(n) | 16800 |
| Square | 1514610724 |
| Cube | 58945620156632 |
| Square root | 197.276456 |
| Digit sum / digital root | 29 / 2 |
| Collatz steps to 1 | 168 |
| Scientific notation | 3.8918 × |
38918 in other forms
| Form | Value |
|---|---|
| In words | thirty-eight thousand nine hundred and eighteen |
| Binary (base 2) | 1001100000000110 |
| Octal (base 8) | 114006 |
| Hexadecimal (base 16) | 9806 |
| Base 3 | 1222101102 |
| As time | 38918 seconds = 10 h 48 min 38 s |
Is 38918 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (38918 ÷ 2 = 19459) | 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 5) | 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 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 | Yes (38918 ÷ 11 = 3538) | 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 38918 a prime number?
No. 38918 = 2 × 11 × 29 × 61, so it is divisible by 2.
What are the factors of 38918?
1, 2, 11, 22, 29, 58, 61, 122, 319, 638, 671, 1342, 1769, 3538, 19459, 38918.
What is 38918 in binary?
1001100000000110 (hexadecimal 9806, octal 114006).
What is the square root of 38918?
About 197.2765.
Is 38918 divisible by 3?
No. Its digits add up to 29, which is not a multiple of 3.
What is special about the number 38918?
38918 is a happy number: repeatedly adding the squares of its digits reaches 1; a Harshad number: divisible by its digit sum 29.