The number 16490
16490 is a composite number with 16 divisors. Its prime factorisation is 2 × 5 × 17 × 97. Divisors (16): 1, 2, 5, 10, 17, 34, 85, 97, 170, 194, 485, 970, 1649, 3298, 8245, 16490.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
16490 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
16490 is composite. Its prime factorisation is
- 3
The divisors add up to 31752; without 16490 itself that is 15262, so 16490 is deficient (15262 is less than 16490). Euler's totient φ(16490) = 6144 numbers up to 16490 share no factor with it.
- 4
The digits of 16490 add up to 20, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 128 steps to reach 1.
LaTeX source of the formulas on this page
\[ 16490 = 2 \times 5 \times 17 \times 97 \]
16490 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 31752 |
| Euler totient φ(n) | 6144 |
| Square | 271920100 |
| Cube | 4483962449000 |
| Square root | 128.413395 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 128 |
| Scientific notation | 1.649 × |
16490 in other forms
| Form | Value |
|---|---|
| In words | sixteen thousand four hundred and ninety |
| Binary (base 2) | 100000001101010 |
| Octal (base 8) | 40152 |
| Hexadecimal (base 16) | 406A |
| Base 3 | 211121202 |
| As time | 16490 seconds = 4 h 34 min 50 s |
Is 16490 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (16490 ÷ 2 = 8245) | 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 (16490 ÷ 5 = 3298) | 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 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 2) | 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 (16490 ÷ 10 = 1649) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 1) | 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 16490 a prime number?
No. 16490 = 2 × 5 × 17 × 97, so it is divisible by 2.
What are the factors of 16490?
1, 2, 5, 10, 17, 34, 85, 97, 170, 194, 485, 970, 1649, 3298, 8245, 16490.
What is 16490 in binary?
100000001101010 (hexadecimal 406A, octal 40152).
What is the square root of 16490?
About 128.4134.
Is 16490 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 16490?
It is a composite number with 16 divisors.