The number 42038
42038 is a composite number with 4 divisors. Its prime factorisation is 2 × 21019. Divisors (4): 1, 2, 21019, 42038.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42038: a semiprime: 2 × 21019, the product of two primes.
- 2
42038 is composite. Its prime factorisation is
- 3
The divisors add up to 63060; without 42038 itself that is 21022, so 42038 is deficient (21022 is less than 42038). Euler's totient φ(42038) = 21018 numbers up to 42038 share no factor with it.
- 4
The digits of 42038 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 119 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42038 = 2 \times 21019 \]
42038 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 63060 |
| Euler totient φ(n) | 21018 |
| Square | 1767193444 |
| Cube | 74289277998872 |
| Square root | 205.031705 |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 119 |
| Scientific notation | 4.2038 × |
42038 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand and thirty-eight |
| Binary (base 2) | 1010010000110110 |
| Octal (base 8) | 122066 |
| Hexadecimal (base 16) | A436 |
| Base 3 | 2010122222 |
| As time | 42038 seconds = 11 h 40 min 38 s |
Is 42038 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (42038 ÷ 2 = 21019) | 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 3) | 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 3) | 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 8) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 8) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 7) | 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 42038 a prime number?
No. 42038 = 2 × 21019, so it is divisible by 2.
What are the factors of 42038?
1, 2, 21019, 42038.
What is 42038 in binary?
1010010000110110 (hexadecimal A436, octal 122066).
What is the square root of 42038?
About 205.0317.
Is 42038 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 42038?
42038 is a semiprime: 2 × 21019, the product of two primes.