The number 47009
47009 is a composite number with 4 divisors. Its prime factorisation is 29 × 1621. Divisors (4): 1, 29, 1621, 47009.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 47009: a semiprime: 29 × 1621, the product of two primes.
- 2
47009 is composite. Its prime factorisation is
- 3
The divisors add up to 48660; without 47009 itself that is 1651, so 47009 is deficient (1651 is less than 47009). Euler's totient φ(47009) = 45360 numbers up to 47009 share no factor with it.
- 4
The digits of 47009 add up to 20, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 145 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47009 = 29 \times 1621 \]
47009 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 48660 |
| Euler totient φ(n) | 45360 |
| Square | 2209846081 |
| Cube | 103882654421729 |
| Square root | 216.815590 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 145 |
| Scientific notation | 4.7009 × |
47009 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand and nine |
| Binary (base 2) | 1011011110100001 |
| Octal (base 8) | 133641 |
| Hexadecimal (base 16) | B7A1 |
| Base 3 | 2101111002 |
| As time | 47009 seconds = 13 h 3 min 29 s |
Is 47009 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 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 5) | 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 2) | 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 6) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 47009 a prime number?
No. 47009 = 29 × 1621, so it is divisible by 29.
What are the factors of 47009?
1, 29, 1621, 47009.
What is 47009 in binary?
1011011110100001 (hexadecimal B7A1, octal 133641).
What is the square root of 47009?
About 216.8156.
Is 47009 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 47009?
47009 is a semiprime: 29 × 1621, the product of two primes.