The number 16990
16990 is a composite number with 8 divisors. Its prime factorisation is 2 × 5 × 1699. Divisors (8): 1, 2, 5, 10, 1699, 3398, 8495, 16990.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
16990 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
16990 is composite. Its prime factorisation is
- 3
The divisors add up to 30600; without 16990 itself that is 13610, so 16990 is deficient (13610 is less than 16990). Euler's totient φ(16990) = 6792 numbers up to 16990 share no factor with it.
- 4
The digits of 16990 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 84 steps to reach 1.
LaTeX source of the formulas on this page
\[ 16990 = 2 \times 5 \times 1699 \]
16990 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 30600 |
| Euler totient φ(n) | 6792 |
| Square | 288660100 |
| Cube | 4904335099000 |
| Square root | 130.345694 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 84 |
| Scientific notation | 1.699 × |
16990 in other forms
| Form | Value |
|---|---|
| In words | sixteen thousand nine hundred and ninety |
| Binary (base 2) | 100001001011110 |
| Octal (base 8) | 41136 |
| Hexadecimal (base 16) | 425E |
| Base 3 | 212022021 |
| As time | 16990 seconds = 4 h 43 min 10 s |
Is 16990 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (16990 ÷ 2 = 8495) | 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 (16990 ÷ 5 = 3398) | 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 1) | 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 7) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | Yes (16990 ÷ 10 = 1699) | 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 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 16990 a prime number?
No. 16990 = 2 × 5 × 1699, so it is divisible by 2.
What are the factors of 16990?
1, 2, 5, 10, 1699, 3398, 8495, 16990.
What is 16990 in binary?
100001001011110 (hexadecimal 425E, octal 41136).
What is the square root of 16990?
About 130.3457.
Is 16990 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 16990?
It is a composite number with 8 divisors.