The number 40990
40990 is a composite number with 8 divisors. Its prime factorisation is 2 × 5 × 4099. Divisors (8): 1, 2, 5, 10, 4099, 8198, 20495, 40990.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
40990 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
40990 is composite. Its prime factorisation is
- 3
The divisors add up to 73800; without 40990 itself that is 32810, so 40990 is deficient (32810 is less than 40990). Euler's totient φ(40990) = 16392 numbers up to 40990 share no factor with it.
- 4
The digits of 40990 add up to 22, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 44 steps to reach 1.
LaTeX source of the formulas on this page
\[ 40990 = 2 \times 5 \times 4099 \]
40990 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 73800 |
| Euler totient φ(n) | 16392 |
| Square | 1680180100 |
| Cube | 68870582299000 |
| Square root | 202.459873 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 44 |
| Scientific notation | 4.099 × |
40990 in other forms
| Form | Value |
|---|---|
| In words | forty thousand nine hundred and ninety |
| Binary (base 2) | 1010000000011110 |
| Octal (base 8) | 120036 |
| Hexadecimal (base 16) | A01E |
| Base 3 | 2002020011 |
| As time | 40990 seconds = 11 h 23 min 10 s |
Is 40990 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (40990 ÷ 2 = 20495) | 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 (40990 ÷ 5 = 8198) | 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 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 4) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | Yes (40990 ÷ 10 = 4099) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 4) | 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 40990 a prime number?
No. 40990 = 2 × 5 × 4099, so it is divisible by 2.
What are the factors of 40990?
1, 2, 5, 10, 4099, 8198, 20495, 40990.
What is 40990 in binary?
1010000000011110 (hexadecimal A01E, octal 120036).
What is the square root of 40990?
About 202.4599.
Is 40990 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 40990?
It is a composite number with 8 divisors.