The number 39490
39490 is a composite number with 16 divisors. Its prime factorisation is 2 × 5 × 11 × 359. Divisors (16): 1, 2, 5, 10, 11, 22, 55, 110, 359, 718, 1795, 3590, 3949, 7898, 19745, 39490.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
39490 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
39490 is composite. Its prime factorisation is
- 3
The divisors add up to 77760; without 39490 itself that is 38270, so 39490 is deficient (38270 is less than 39490). Euler's totient φ(39490) = 14320 numbers up to 39490 share no factor with it.
- 4
The digits of 39490 add up to 25, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 137 steps to reach 1.
LaTeX source of the formulas on this page
\[ 39490 = 2 \times 5 \times 11 \times 359 \]
39490 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 77760 |
| Euler totient φ(n) | 14320 |
| Square | 1559460100 |
| Cube | 61583079349000 |
| Square root | 198.720910 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 137 |
| Scientific notation | 3.949 × |
39490 in other forms
| Form | Value |
|---|---|
| In words | thirty-nine thousand four hundred and ninety |
| Binary (base 2) | 1001101001000010 |
| Octal (base 8) | 115102 |
| Hexadecimal (base 16) | 9A42 |
| Base 3 | 2000011121 |
| As time | 39490 seconds = 10 h 58 min 10 s |
Is 39490 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (39490 ÷ 2 = 19745) | 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 | Yes (39490 ÷ 5 = 7898) | 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 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 7) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | Yes (39490 ÷ 10 = 3949) | A number is divisible by 10 if the last digit is 0. |
| 11 | Yes (39490 ÷ 11 = 3590) | 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 39490 a prime number?
No. 39490 = 2 × 5 × 11 × 359, so it is divisible by 2.
What are the factors of 39490?
1, 2, 5, 10, 11, 22, 55, 110, 359, 718, 1795, 3590, 3949, 7898, 19745, 39490.
What is 39490 in binary?
1001101001000010 (hexadecimal 9A42, octal 115102).
What is the square root of 39490?
About 198.7209.
Is 39490 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 39490?
It is a composite number with 16 divisors.