The number 43994
43994 is a composite number with 4 divisors. Its prime factorisation is 2 × 21997. Divisors (4): 1, 2, 21997, 43994.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 43994: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 2 × 21997, the product of two primes.
- 2
43994 is composite. Its prime factorisation is
- 3
The divisors add up to 65994; without 43994 itself that is 22000, so 43994 is deficient (22000 is less than 43994). Euler's totient φ(43994) = 21996 numbers up to 43994 share no factor with it.
- 4
The digits of 43994 add up to 29, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 70 steps to reach 1.
LaTeX source of the formulas on this page
\[ 43994 = 2 \times 21997 \]
43994 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 65994 |
| Euler totient φ(n) | 21996 |
| Square | 1935472036 |
| Cube | 85149156751784 |
| Square root | 209.747467 |
| Digit sum / digital root | 29 / 2 |
| Collatz steps to 1 | 70 |
| Scientific notation | 4.3994 × |
43994 in other forms
| Form | Value |
|---|---|
| In words | forty-three thousand nine hundred and ninety-four |
| Binary (base 2) | 1010101111011010 |
| Octal (base 8) | 125732 |
| Hexadecimal (base 16) | ABDA |
| Base 3 | 2020100102 |
| As time | 43994 seconds = 12 h 13 min 14 s |
Is 43994 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (43994 ÷ 2 = 21997) | 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 2) | 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 2) | 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 2) | 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 4) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 5) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 43994 a prime number?
No. 43994 = 2 × 21997, so it is divisible by 2.
What are the factors of 43994?
1, 2, 21997, 43994.
What is 43994 in binary?
1010101111011010 (hexadecimal ABDA, octal 125732).
What is the square root of 43994?
About 209.7475.
Is 43994 divisible by 3?
No. Its digits add up to 29, which is not a multiple of 3.
What is special about the number 43994?
43994 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 2 × 21997, the product of two primes.