The number 47409
47409 is a composite number with 4 divisors. Its prime factorisation is 3 × 15803. Divisors (4): 1, 3, 15803, 47409.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 47409: a semiprime: 3 × 15803, the product of two primes.
- 2
47409 is composite. Its prime factorisation is
- 3
The divisors add up to 63216; without 47409 itself that is 15807, so 47409 is deficient (15807 is less than 47409). Euler's totient φ(47409) = 31604 numbers up to 47409 share no factor with it.
- 4
The digits of 47409 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 189 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47409 = 3 \times 15803 \]
47409 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 63216 |
| Euler totient φ(n) | 31604 |
| Square | 2247613281 |
| Cube | 106557098038929 |
| Square root | 217.736079 |
| Digit sum / digital root | 24 / 6 |
| Collatz steps to 1 | 189 |
| Scientific notation | 4.7409 × |
47409 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand four hundred and nine |
| Binary (base 2) | 1011100100110001 |
| Octal (base 8) | 134461 |
| Hexadecimal (base 16) | B931 |
| Base 3 | 2102000220 |
| As time | 47409 seconds = 13 h 10 min 9 s |
Is 47409 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 (47409 ÷ 3 = 15803) | 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 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 1) | 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 9) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 10) | 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 47409 a prime number?
No. 47409 = 3 × 15803, so it is divisible by 3.
What are the factors of 47409?
1, 3, 15803, 47409.
What is 47409 in binary?
1011100100110001 (hexadecimal B931, octal 134461).
What is the square root of 47409?
About 217.7361.
Is 47409 divisible by 3?
Yes. Its digits add up to 24, a multiple of 3.
What is special about the number 47409?
47409 is a semiprime: 3 × 15803, the product of two primes.