The number 49821
49821 is a composite number with 4 divisors. Its prime factorisation is 3 × 16607. Divisors (4): 1, 3, 16607, 49821.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 49821: a semiprime: 3 × 16607, the product of two primes.
- 2
49821 is composite. Its prime factorisation is
- 3
The divisors add up to 66432; without 49821 itself that is 16611, so 49821 is deficient (16611 is less than 49821). Euler's totient φ(49821) = 33212 numbers up to 49821 share no factor with it.
- 4
The digits of 49821 add up to 24, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 127 steps to reach 1.
LaTeX source of the formulas on this page
\[ 49821 = 3 \times 16607 \]
49821 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 66432 |
| Euler totient φ(n) | 33212 |
| Square | 2482132041 |
| Cube | 123662300414661 |
| Square root | 223.206183 |
| Digit sum / digital root | 24 / 6 |
| Collatz steps to 1 | 127 |
| Scientific notation | 4.9821 × |
49821 in other forms
| Form | Value |
|---|---|
| In words | forty-nine thousand eight hundred and twenty-one |
| Binary (base 2) | 1100001010011101 |
| Octal (base 8) | 141235 |
| Hexadecimal (base 16) | C29D |
| Base 3 | 2112100020 |
| As time | 49821 seconds = 13 h 50 min 21 s |
Is 49821 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 (49821 ÷ 3 = 16607) | 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 2) | 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 2) | 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 49821 a prime number?
No. 49821 = 3 × 16607, so it is divisible by 3.
What are the factors of 49821?
1, 3, 16607, 49821.
What is 49821 in binary?
1100001010011101 (hexadecimal C29D, octal 141235).
What is the square root of 49821?
About 223.2062.
Is 49821 divisible by 3?
Yes. Its digits add up to 24, a multiple of 3.
What is special about the number 49821?
49821 is a semiprime: 3 × 16607, the product of two primes.