The number 40389
40389 is a composite number with 4 divisors. Its prime factorisation is 3 × 13463. Divisors (4): 1, 3, 13463, 40389.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 40389: a semiprime: 3 × 13463, the product of two primes.
- 2
40389 is composite. Its prime factorisation is
- 3
The divisors add up to 53856; without 40389 itself that is 13467, so 40389 is deficient (13467 is less than 40389). Euler's totient φ(40389) = 26924 numbers up to 40389 share no factor with it.
- 4
The digits of 40389 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 44 steps to reach 1.
LaTeX source of the formulas on this page
\[ 40389 = 3 \times 13463 \]
40389 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 53856 |
| Euler totient φ(n) | 26924 |
| Square | 1631271321 |
| Cube | 65885417383869 |
| Square root | 200.970147 |
| Digit sum / digital root | 24 / 6 |
| Collatz steps to 1 | 44 |
| Scientific notation | 4.0389 × |
40389 in other forms
| Form | Value |
|---|---|
| In words | forty thousand three hundred and eighty-nine |
| Binary (base 2) | 1001110111000101 |
| Octal (base 8) | 116705 |
| Hexadecimal (base 16) | 9DC5 |
| Base 3 | 2001101220 |
| As time | 40389 seconds = 11 h 13 min 9 s |
Is 40389 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 (40389 ÷ 3 = 13463) | 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 6) | 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 5) | 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 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 40389 a prime number?
No. 40389 = 3 × 13463, so it is divisible by 3.
What are the factors of 40389?
1, 3, 13463, 40389.
What is 40389 in binary?
1001110111000101 (hexadecimal 9DC5, octal 116705).
What is the square root of 40389?
About 200.9701.
Is 40389 divisible by 3?
Yes. Its digits add up to 24, a multiple of 3.
What is special about the number 40389?
40389 is a semiprime: 3 × 13463, the product of two primes.