The number 38021
38021 is a composite number with 4 divisors. Its prime factorisation is 193 × 197. Divisors (4): 1, 193, 197, 38021.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 38021: a semiprime: 193 × 197, the product of two primes.
- 2
38021 is composite. Its prime factorisation is
- 3
The divisors add up to 38412; without 38021 itself that is 391, so 38021 is deficient (391 is less than 38021). Euler's totient φ(38021) = 37632 numbers up to 38021 share no factor with it.
- 4
The digits of 38021 add up to 14, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 124 steps to reach 1.
LaTeX source of the formulas on this page
\[ 38021 = 193 \times 197 \]
38021 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 38412 |
| Euler totient φ(n) | 37632 |
| Square | 1445596441 |
| Cube | 54963022283261 |
| Square root | 194.989743 |
| Digit sum / digital root | 14 / 5 |
| Collatz steps to 1 | 124 |
| Scientific notation | 3.8021 × |
38021 in other forms
| Form | Value |
|---|---|
| In words | thirty-eight thousand and twenty-one |
| Binary (base 2) | 1001010010000101 |
| Octal (base 8) | 112205 |
| Hexadecimal (base 16) | 9485 |
| Base 3 | 1221011012 |
| As time | 38021 seconds = 10 h 33 min 41 s |
Is 38021 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 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 5) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 4) | 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 5) | 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 5) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 38021 a prime number?
No. 38021 = 193 × 197, so it is divisible by 193.
What are the factors of 38021?
1, 193, 197, 38021.
What is 38021 in binary?
1001010010000101 (hexadecimal 9485, octal 112205).
What is the square root of 38021?
About 194.9897.
Is 38021 divisible by 3?
No. Its digits add up to 14, which is not a multiple of 3.
What is special about the number 38021?
38021 is a semiprime: 193 × 197, the product of two primes.