The number 90242
90242 is a composite number with 4 divisors. Its prime factorisation is 2 × 45121. Divisors (4): 1, 2, 45121, 90242.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 90242: a semiprime: 2 × 45121, the product of two primes.
- 2
90242 is composite. Its prime factorisation is
- 3
The divisors add up to 135366; without 90242 itself that is 45124, so 90242 is deficient (45124 is less than 90242). Euler's totient φ(90242) = 45120 numbers up to 90242 share no factor with it.
- 4
The digits of 90242 add up to 17, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 89 steps to reach 1.
LaTeX source of the formulas on this page
\[ 90242 = 2 \times 45121 \]
90242 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 135366 |
| Euler totient φ(n) | 45120 |
| Square | 8143618564 |
| Cube | 734896426452488 |
| Square root | 300.403063 |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 89 |
| Scientific notation | 9.0242 × |
90242 in other forms
| Form | Value |
|---|---|
| In words | ninety thousand two hundred and forty-two |
| Binary (base 2) | 10110000010000010 |
| Octal (base 8) | 260202 |
| Hexadecimal (base 16) | 16082 |
| Base 3 | 11120210022 |
| As time | 90242 seconds = 25 h 4 min 2 s |
Is 90242 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (90242 ÷ 2 = 45121) | 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 | No (remainder 2) | 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 8) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 2) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 9) | 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 90242 a prime number?
No. 90242 = 2 × 45121, so it is divisible by 2.
What are the factors of 90242?
1, 2, 45121, 90242.
What is 90242 in binary?
10110000010000010 (hexadecimal 16082, octal 260202).
What is the square root of 90242?
About 300.4031.
Is 90242 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 90242?
90242 is a semiprime: 2 × 45121, the product of two primes.