The number 38990
38990 is a composite number with 16 divisors. Its prime factorisation is 2 × 5 × 7 × 557. Divisors (16): 1, 2, 5, 7, 10, 14, 35, 70, 557, 1114, 2785, 3899, 5570, 7798, 19495, 38990.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
38990 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
38990 is composite. Its prime factorisation is
- 3
The divisors add up to 80352; without 38990 itself that is 41362, so 38990 is abundant (41362 is more than 38990). Euler's totient φ(38990) = 13344 numbers up to 38990 share no factor with it.
- 4
The digits of 38990 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 124 steps to reach 1.
LaTeX source of the formulas on this page
\[ 38990 = 2 \times 5 \times 7 \times 557 \]
38990 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 80352 |
| Euler totient φ(n) | 13344 |
| Square | 1520220100 |
| Cube | 59273381699000 |
| Square root | 197.458856 |
| Digit sum / digital root | 29 / 2 |
| Collatz steps to 1 | 124 |
| Scientific notation | 3.899 × |
38990 in other forms
| Form | Value |
|---|---|
| In words | thirty-eight thousand nine hundred and ninety |
| Binary (base 2) | 1001100001001110 |
| Octal (base 8) | 114116 |
| Hexadecimal (base 16) | 984E |
| Base 3 | 1222111002 |
| As time | 38990 seconds = 10 h 49 min 50 s |
Is 38990 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (38990 ÷ 2 = 19495) | 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 (38990 ÷ 5 = 7798) | 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 | Yes (38990 ÷ 7 = 5570) | 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 | Yes (38990 ÷ 10 = 3899) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 6) | 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 38990 a prime number?
No. 38990 = 2 × 5 × 7 × 557, so it is divisible by 2.
What are the factors of 38990?
1, 2, 5, 7, 10, 14, 35, 70, 557, 1114, 2785, 3899, 5570, 7798, 19495, 38990.
What is 38990 in binary?
1001100001001110 (hexadecimal 984E, octal 114116).
What is the square root of 38990?
About 197.4589.
Is 38990 divisible by 3?
No. Its digits add up to 29, which is not a multiple of 3.
What is special about the number 38990?
It is a composite number with 16 divisors.