The number 39801
39801 is a composite number with 4 divisors. Its prime factorisation is 3 × 13267. Divisors (4): 1, 3, 13267, 39801.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 39801: a semiprime: 3 × 13267, the product of two primes.
- 2
39801 is composite. Its prime factorisation is
- 3
The divisors add up to 53072; without 39801 itself that is 13271, so 39801 is deficient (13271 is less than 39801). Euler's totient φ(39801) = 26532 numbers up to 39801 share no factor with it.
- 4
The digits of 39801 add up to 21, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 75 steps to reach 1.
LaTeX source of the formulas on this page
\[ 39801 = 3 \times 13267 \]
39801 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 53072 |
| Euler totient φ(n) | 26532 |
| Square | 1584119601 |
| Cube | 63049544239401 |
| Square root | 199.501880 |
| Digit sum / digital root | 21 / 3 |
| Collatz steps to 1 | 75 |
| Scientific notation | 3.9801 × |
39801 in other forms
| Form | Value |
|---|---|
| In words | thirty-nine thousand eight hundred and one |
| Binary (base 2) | 1001101101111001 |
| Octal (base 8) | 115571 |
| Hexadecimal (base 16) | 9B79 |
| Base 3 | 2000121010 |
| As time | 39801 seconds = 11 h 3 min 21 s |
Is 39801 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 (39801 ÷ 3 = 13267) | 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 6) | 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 1) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 3) | 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 3) | 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 39801 a prime number?
No. 39801 = 3 × 13267, so it is divisible by 3.
What are the factors of 39801?
1, 3, 13267, 39801.
What is 39801 in binary?
1001101101111001 (hexadecimal 9B79, octal 115571).
What is the square root of 39801?
About 199.5019.
Is 39801 divisible by 3?
Yes. Its digits add up to 21, a multiple of 3.
What is special about the number 39801?
39801 is a semiprime: 3 × 13267, the product of two primes.