The number 7490
7490 is a composite number with 16 divisors. Its prime factorisation is 2 × 5 × 7 × 107. Divisors (16): 1, 2, 5, 7, 10, 14, 35, 70, 107, 214, 535, 749, 1070, 1498, 3745, 7490.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
7490 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
7490 is composite. Its prime factorisation is
- 3
The divisors add up to 15552; without 7490 itself that is 8062, so 7490 is abundant (8062 is more than 7490). Euler's totient φ(7490) = 2544 numbers up to 7490 share no factor with it.
- 4
The digits of 7490 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 163 steps to reach 1.
LaTeX source of the formulas on this page
\[ 7490 = 2 \times 5 \times 7 \times 107 \]
7490 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 15552 |
| Euler totient φ(n) | 2544 |
| Square | 56100100 |
| Cube | 420189749000 |
| Square root | 86.544786 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 163 |
| Scientific notation | 7.49 × |
7490 in other forms
| Form | Value |
|---|---|
| In words | seven thousand four hundred and ninety |
| Binary (base 2) | 1110101000010 |
| Octal (base 8) | 16502 |
| Hexadecimal (base 16) | 1D42 |
| Base 3 | 101021102 |
| As time | 7490 seconds = 2 h 4 min 50 s |
Is 7490 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (7490 ÷ 2 = 3745) | 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 (7490 ÷ 5 = 1498) | 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 | Yes (7490 ÷ 7 = 1070) | 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 (7490 ÷ 10 = 749) | 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 7490 a prime number?
No. 7490 = 2 × 5 × 7 × 107, so it is divisible by 2.
What are the factors of 7490?
1, 2, 5, 7, 10, 14, 35, 70, 107, 214, 535, 749, 1070, 1498, 3745, 7490.
What is 7490 in binary?
1110101000010 (hexadecimal 1D42, octal 16502).
What is the square root of 7490?
About 86.5448.
Is 7490 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 7490?
It is a composite number with 16 divisors.