The number 42621
42621 is a composite number with 4 divisors. Its prime factorisation is 3 × 14207. Divisors (4): 1, 3, 14207, 42621.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42621: a semiprime: 3 × 14207, the product of two primes.
- 2
42621 is composite. Its prime factorisation is
- 3
The divisors add up to 56832; without 42621 itself that is 14211, so 42621 is deficient (14211 is less than 42621). Euler's totient φ(42621) = 28412 numbers up to 42621 share no factor with it.
- 4
The digits of 42621 add up to 15, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 150 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42621 = 3 \times 14207 \]
42621 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 56832 |
| Euler totient φ(n) | 28412 |
| Square | 1816549641 |
| Cube | 77423162249061 |
| Square root | 206.448541 |
| Digit sum / digital root | 15 / 6 |
| Collatz steps to 1 | 150 |
| Scientific notation | 4.2621 × |
42621 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand six hundred and twenty-one |
| Binary (base 2) | 1010011001111101 |
| Octal (base 8) | 123175 |
| Hexadecimal (base 16) | A67D |
| Base 3 | 2011110120 |
| As time | 42621 seconds = 11 h 50 min 21 s |
Is 42621 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 | Yes (42621 ÷ 3 = 14207) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 1) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 1) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 3) | 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 5) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 6) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 1) | 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 9) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42621 a prime number?
No. 42621 = 3 × 14207, so it is divisible by 3.
What are the factors of 42621?
1, 3, 14207, 42621.
What is 42621 in binary?
1010011001111101 (hexadecimal A67D, octal 123175).
What is the square root of 42621?
About 206.4485.
Is 42621 divisible by 3?
Yes. Its digits add up to 15, a multiple of 3.
What is special about the number 42621?
42621 is a semiprime: 3 × 14207, the product of two primes.