The number 49847
49847 is a composite number with 4 divisors. Its prime factorisation is 7 × 7121. Divisors (4): 1, 7, 7121, 49847.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 49847: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 7 × 7121, the product of two primes.
- 2
49847 is composite. Its prime factorisation is
- 3
The divisors add up to 56976; without 49847 itself that is 7129, so 49847 is deficient (7129 is less than 49847). Euler's totient φ(49847) = 42720 numbers up to 49847 share no factor with it.
- 4
The digits of 49847 add up to 32, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 39 steps to reach 1.
LaTeX source of the formulas on this page
\[ 49847 = 7 \times 7121 \]
49847 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 56976 |
| Euler totient φ(n) | 42720 |
| Square | 2484723409 |
| Cube | 123856007768423 |
| Square root | 223.264417 |
| Digit sum / digital root | 32 / 5 |
| Collatz steps to 1 | 39 |
| Scientific notation | 4.9847 × |
49847 in other forms
| Form | Value |
|---|---|
| In words | forty-nine thousand eight hundred and forty-seven |
| Binary (base 2) | 1100001010110111 |
| Octal (base 8) | 141267 |
| Hexadecimal (base 16) | C2B7 |
| Base 3 | 2112101012 |
| As time | 49847 seconds = 13 h 50 min 47 s |
Is 49847 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 3) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 2) | 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 | Yes (49847 ÷ 7 = 7121) | 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 7) | 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 7) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 6) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 11) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 49847 a prime number?
No. 49847 = 7 × 7121, so it is divisible by 7.
What are the factors of 49847?
1, 7, 7121, 49847.
What is 49847 in binary?
1100001010110111 (hexadecimal C2B7, octal 141267).
What is the square root of 49847?
About 223.2644.
Is 49847 divisible by 3?
No. Its digits add up to 32, which is not a multiple of 3.
What is special about the number 49847?
49847 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 7 × 7121, the product of two primes.