The number 84490
84490 is a composite number with 32 divisors. Its prime factorisation is 2 × 5 × 7 × 17 × 71. Divisors (32): 1, 2, 5, 7, 10, 14, 17, 34, 35, 70, 71, 85, 119, 142, 170, 238 … 84490.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
84490 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
84490 is composite. Its prime factorisation is
- 3
The divisors add up to 186624; without 84490 itself that is 102134, so 84490 is abundant (102134 is more than 84490). Euler's totient φ(84490) = 26880 numbers up to 84490 share no factor with it.
- 4
The digits of 84490 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 58 steps to reach 1.
LaTeX source of the formulas on this page
\[ 84490 = 2 \times 5 \times 7 \times 17 \times 71 \]
84490 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 32 |
| Sum of divisors | 186624 |
| Euler totient φ(n) | 26880 |
| Square | 7138560100 |
| Cube | 603136942849000 |
| Square root | 290.671636 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 58 |
| Scientific notation | 8.449 × |
84490 in other forms
| Form | Value |
|---|---|
| In words | eighty-four thousand four hundred and ninety |
| Binary (base 2) | 10100101000001010 |
| Octal (base 8) | 245012 |
| Hexadecimal (base 16) | 14A0A |
| Base 3 | 11021220021 |
| As time | 84490 seconds = 23 h 28 min 10 s |
Is 84490 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (84490 ÷ 2 = 42245) | 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 (84490 ÷ 5 = 16898) | 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 | Yes (84490 ÷ 7 = 12070) | 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 (84490 ÷ 10 = 8449) | 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 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 84490 a prime number?
No. 84490 = 2 × 5 × 7 × 17 × 71, so it is divisible by 2.
What are the factors of 84490?
1, 2, 5, 7, 10, 14, 17, 34, 35, 70, 71, 85, 119, 142, 170, 238, 355, 497, 595, 710, 994, 1190, 1207, 2414, 2485, 4970, 6035, 8449, 12070, 16898, 42245, 84490.
What is 84490 in binary?
10100101000001010 (hexadecimal 14A0A, octal 245012).
What is the square root of 84490?
About 290.6716.
Is 84490 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 84490?
It is a composite number with 32 divisors.