The number 46821
46821 is a composite number with 4 divisors. Its prime factorisation is 3 × 15607. Divisors (4): 1, 3, 15607, 46821.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 46821: a semiprime: 3 × 15607, the product of two primes.
- 2
46821 is composite. Its prime factorisation is
- 3
The divisors add up to 62432; without 46821 itself that is 15611, so 46821 is deficient (15611 is less than 46821). Euler's totient φ(46821) = 31212 numbers up to 46821 share no factor with it.
- 4
The digits of 46821 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 145 steps to reach 1.
LaTeX source of the formulas on this page
\[ 46821 = 3 \times 15607 \]
46821 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 62432 |
| Euler totient φ(n) | 31212 |
| Square | 2192206041 |
| Cube | 102641279045661 |
| Square root | 216.381607 |
| Digit sum / digital root | 21 / 3 |
| Collatz steps to 1 | 145 |
| Scientific notation | 4.6821 × |
46821 in other forms
| Form | Value |
|---|---|
| In words | forty-six thousand eight hundred and twenty-one |
| Binary (base 2) | 1011011011100101 |
| Octal (base 8) | 133345 |
| Hexadecimal (base 16) | B6E5 |
| Base 3 | 2101020010 |
| As time | 46821 seconds = 13 h 0 min 21 s |
Is 46821 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 (46821 ÷ 3 = 15607) | 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 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 5) | 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 46821 a prime number?
No. 46821 = 3 × 15607, so it is divisible by 3.
What are the factors of 46821?
1, 3, 15607, 46821.
What is 46821 in binary?
1011011011100101 (hexadecimal B6E5, octal 133345).
What is the square root of 46821?
About 216.3816.
Is 46821 divisible by 3?
Yes. Its digits add up to 21, a multiple of 3.
What is special about the number 46821?
46821 is a semiprime: 3 × 15607, the product of two primes.