The number 42047
42047 is a composite number with 4 divisors. Its prime factorisation is 19 × 2213. Divisors (4): 1, 19, 2213, 42047.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42047: a semiprime: 19 × 2213, the product of two primes.
- 2
42047 is composite. Its prime factorisation is
- 3
The divisors add up to 44280; without 42047 itself that is 2233, so 42047 is deficient (2233 is less than 42047). Euler's totient φ(42047) = 39816 numbers up to 42047 share no factor with it.
- 4
The digits of 42047 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 57 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42047 = 19 \times 2213 \]
42047 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 44280 |
| Euler totient φ(n) | 39816 |
| Square | 1767950209 |
| Cube | 74337002437823 |
| Square root | 205.053652 |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 57 |
| Scientific notation | 4.2047 × |
42047 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand and forty-seven |
| Binary (base 2) | 1010010000111111 |
| Octal (base 8) | 122077 |
| Hexadecimal (base 16) | A43F |
| Base 3 | 2010200022 |
| As time | 42047 seconds = 11 h 40 min 47 s |
Is 42047 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | No (remainder 1) | 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 3) | 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 5) | 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 7) | 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 7) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 5) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 11) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42047 a prime number?
No. 42047 = 19 × 2213, so it is divisible by 19.
What are the factors of 42047?
1, 19, 2213, 42047.
What is 42047 in binary?
1010010000111111 (hexadecimal A43F, octal 122077).
What is the square root of 42047?
About 205.0537.
Is 42047 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 42047?
42047 is a semiprime: 19 × 2213, the product of two primes.