The number 39021
39021 is a composite number with 4 divisors. Its prime factorisation is 3 × 13007. Divisors (4): 1, 3, 13007, 39021.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 39021: a semiprime: 3 × 13007, the product of two primes.
- 2
39021 is composite. Its prime factorisation is
- 3
The divisors add up to 52032; without 39021 itself that is 13011, so 39021 is deficient (13011 is less than 39021). Euler's totient φ(39021) = 26012 numbers up to 39021 share no factor with it.
- 4
The digits of 39021 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 62 steps to reach 1.
LaTeX source of the formulas on this page
\[ 39021 = 3 \times 13007 \]
39021 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 52032 |
| Euler totient φ(n) | 26012 |
| Square | 1522638441 |
| Cube | 59414874606261 |
| Square root | 197.537338 |
| Digit sum / digital root | 15 / 6 |
| Collatz steps to 1 | 62 |
| Scientific notation | 3.9021 × |
39021 in other forms
| Form | Value |
|---|---|
| In words | thirty-nine thousand and twenty-one |
| Binary (base 2) | 1001100001101101 |
| Octal (base 8) | 114155 |
| Hexadecimal (base 16) | 986D |
| Base 3 | 1222112020 |
| As time | 39021 seconds = 10 h 50 min 21 s |
Is 39021 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 (39021 ÷ 3 = 13007) | 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 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 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 4) | 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 39021 a prime number?
No. 39021 = 3 × 13007, so it is divisible by 3.
What are the factors of 39021?
1, 3, 13007, 39021.
What is 39021 in binary?
1001100001101101 (hexadecimal 986D, octal 114155).
What is the square root of 39021?
About 197.5373.
Is 39021 divisible by 3?
Yes. Its digits add up to 15, a multiple of 3.
What is special about the number 39021?
39021 is a semiprime: 3 × 13007, the product of two primes.