The number 49809
49809 is a composite number with 4 divisors. Its prime factorisation is 3 × 16603. Divisors (4): 1, 3, 16603, 49809.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 49809: a semiprime: 3 × 16603, the product of two primes.
- 2
49809 is composite. Its prime factorisation is
- 3
The divisors add up to 66416; without 49809 itself that is 16607, so 49809 is deficient (16607 is less than 49809). Euler's totient φ(49809) = 33204 numbers up to 49809 share no factor with it.
- 4
The digits of 49809 add up to 30, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 158 steps to reach 1.
LaTeX source of the formulas on this page
\[ 49809 = 3 \times 16603 \]
49809 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 66416 |
| Euler totient φ(n) | 33204 |
| Square | 2480936481 |
| Cube | 123572965182129 |
| Square root | 223.179300 |
| Digit sum / digital root | 30 / 3 |
| Collatz steps to 1 | 158 |
| Scientific notation | 4.9809 × |
49809 in other forms
| Form | Value |
|---|---|
| In words | forty-nine thousand eight hundred and nine |
| Binary (base 2) | 1100001010010001 |
| Octal (base 8) | 141221 |
| Hexadecimal (base 16) | C291 |
| Base 3 | 2112022210 |
| As time | 49809 seconds = 13 h 50 min 9 s |
Is 49809 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 (49809 ÷ 3 = 16603) | 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 4) | 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 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 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 9) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 1) | 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 49809 a prime number?
No. 49809 = 3 × 16603, so it is divisible by 3.
What are the factors of 49809?
1, 3, 16603, 49809.
What is 49809 in binary?
1100001010010001 (hexadecimal C291, octal 141221).
What is the square root of 49809?
About 223.1793.
Is 49809 divisible by 3?
Yes. Its digits add up to 30, a multiple of 3.
What is special about the number 49809?
49809 is a semiprime: 3 × 16603, the product of two primes.