The number 40490
40490 is a composite number with 8 divisors. Its prime factorisation is 2 × 5 × 4049. Divisors (8): 1, 2, 5, 10, 4049, 8098, 20245, 40490.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
40490 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
40490 is composite. Its prime factorisation is
- 3
The divisors add up to 72900; without 40490 itself that is 32410, so 40490 is deficient (32410 is less than 40490). Euler's totient φ(40490) = 16192 numbers up to 40490 share no factor with it.
- 4
The digits of 40490 add up to 17, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 44 steps to reach 1.
LaTeX source of the formulas on this page
\[ 40490 = 2 \times 5 \times 4049 \]
40490 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 72900 |
| Euler totient φ(n) | 16192 |
| Square | 1639440100 |
| Cube | 66380929649000 |
| Square root | 201.221271 |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 44 |
| Scientific notation | 4.049 × |
40490 in other forms
| Form | Value |
|---|---|
| In words | forty thousand four hundred and ninety |
| Binary (base 2) | 1001111000101010 |
| Octal (base 8) | 117052 |
| Hexadecimal (base 16) | 9E2A |
| Base 3 | 2001112122 |
| As time | 40490 seconds = 11 h 14 min 50 s |
Is 40490 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (40490 ÷ 2 = 20245) | 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 (40490 ÷ 5 = 8098) | 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 2) | 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 (40490 ÷ 10 = 4049) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 10) | 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 40490 a prime number?
No. 40490 = 2 × 5 × 4049, so it is divisible by 2.
What are the factors of 40490?
1, 2, 5, 10, 4049, 8098, 20245, 40490.
What is 40490 in binary?
1001111000101010 (hexadecimal 9E2A, octal 117052).
What is the square root of 40490?
About 201.2213.
Is 40490 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 40490?
It is a composite number with 8 divisors.