The number 71409
71409 is a composite number with 8 divisors. Its prime factorisation is 3 × 13 × 1831. Divisors (8): 1, 3, 13, 39, 1831, 5493, 23803, 71409.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
71409 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
71409 is composite. Its prime factorisation is
- 3
The divisors add up to 102592; without 71409 itself that is 31183, so 71409 is deficient (31183 is less than 71409). Euler's totient φ(71409) = 43920 numbers up to 71409 share no factor with it.
- 4
The digits of 71409 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 99 steps to reach 1.
LaTeX source of the formulas on this page
\[ 71409 = 3 \times 13 \times 1831 \]
71409 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 102592 |
| Euler totient φ(n) | 43920 |
| Square | 5099245281 |
| Cube | 364132006270929 |
| Square root | 267.224625 |
| Digit sum / digital root | 21 / 3 |
| Collatz steps to 1 | 99 |
| Scientific notation | 7.1409 × |
71409 in other forms
| Form | Value |
|---|---|
| In words | seventy-one thousand four hundred and nine |
| Binary (base 2) | 10001011011110001 |
| Octal (base 8) | 213361 |
| Hexadecimal (base 16) | 116F1 |
| Base 3 | 10121221210 |
| As time | 71409 seconds = 19 h 50 min 9 s |
Is 71409 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 (71409 ÷ 3 = 23803) | 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 2) | 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 8) | 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 71409 a prime number?
No. 71409 = 3 × 13 × 1831, so it is divisible by 3.
What are the factors of 71409?
1, 3, 13, 39, 1831, 5493, 23803, 71409.
What is 71409 in binary?
10001011011110001 (hexadecimal 116F1, octal 213361).
What is the square root of 71409?
About 267.2246.
Is 71409 divisible by 3?
Yes. Its digits add up to 21, a multiple of 3.
What is special about the number 71409?
It is a composite number with 8 divisors.