The number 38690
38690 is a composite number with 16 divisors. Its prime factorisation is 2 × 5 × 53 × 73. Divisors (16): 1, 2, 5, 10, 53, 73, 106, 146, 265, 365, 530, 730, 3869, 7738, 19345, 38690.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 38690: a happy number: repeatedly adding the squares of its digits reaches 1.
- 2
38690 is composite. Its prime factorisation is
- 3
The divisors add up to 71928; without 38690 itself that is 33238, so 38690 is deficient (33238 is less than 38690). Euler's totient φ(38690) = 14976 numbers up to 38690 share no factor with it.
- 4
The digits of 38690 add up to 26, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 62 steps to reach 1.
LaTeX source of the formulas on this page
\[ 38690 = 2 \times 5 \times 53 \times 73 \]
38690 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 71928 |
| Euler totient φ(n) | 14976 |
| Square | 1496916100 |
| Cube | 57915683909000 |
| Square root | 196.697738 |
| Digit sum / digital root | 26 / 8 |
| Collatz steps to 1 | 62 |
| Scientific notation | 3.869 × |
38690 in other forms
| Form | Value |
|---|---|
| In words | thirty-eight thousand six hundred and ninety |
| Binary (base 2) | 1001011100100010 |
| Octal (base 8) | 113442 |
| Hexadecimal (base 16) | 9722 |
| Base 3 | 1222001222 |
| As time | 38690 seconds = 10 h 44 min 50 s |
Is 38690 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (38690 ÷ 2 = 19345) | 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 | Yes (38690 ÷ 5 = 7738) | 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 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 8) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | Yes (38690 ÷ 10 = 3869) | 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 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 38690 a prime number?
No. 38690 = 2 × 5 × 53 × 73, so it is divisible by 2.
What are the factors of 38690?
1, 2, 5, 10, 53, 73, 106, 146, 265, 365, 530, 730, 3869, 7738, 19345, 38690.
What is 38690 in binary?
1001011100100010 (hexadecimal 9722, octal 113442).
What is the square root of 38690?
About 196.6977.
Is 38690 divisible by 3?
No. Its digits add up to 26, which is not a multiple of 3.
What is special about the number 38690?
38690 is a happy number: repeatedly adding the squares of its digits reaches 1.