The number 3994
3994 is a composite number with 4 divisors. Its prime factorisation is 2 × 1997. Divisors (4): 1, 2, 1997, 3994.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 3994: a semiprime: 2 × 1997, the product of two primes.
- 2
3994 is composite. Its prime factorisation is
- 3
The divisors add up to 5994; without 3994 itself that is 2000, so 3994 is deficient (2000 is less than 3994). Euler's totient φ(3994) = 1996 numbers up to 3994 share no factor with it.
- 4
The digits of 3994 add up to 25, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 51 steps to reach 1.
LaTeX source of the formulas on this page
\[ 3994 = 2 \times 1997 \]
3994 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 5994 |
| Euler totient φ(n) | 1996 |
| Square | 15952036 |
| Cube | 63712431784 |
| Square root | 63.198101 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 51 |
| Scientific notation | 3.994 × |
3994 in other forms
| Form | Value |
|---|---|
| In words | three thousand nine hundred and ninety-four |
| Roman numerals | MMMCMXCIV |
| Binary (base 2) | 111110011010 |
| Octal (base 8) | 7632 |
| Hexadecimal (base 16) | F9A |
| Base 3 | 12110221 |
| As time | 3994 seconds = 1 h 6 min 34 s |
Is 3994 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (3994 ÷ 2 = 1997) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 1) | 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 4) | 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 2) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 7) | 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 1) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 3994 a prime number?
No. 3994 = 2 × 1997, so it is divisible by 2.
What are the factors of 3994?
1, 2, 1997, 3994.
What is 3994 in binary?
111110011010 (hexadecimal F9A, octal 7632).
What is the square root of 3994?
About 63.1981.
What is 3994 in Roman numerals?
MMMCMXCIV.
Is 3994 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 3994?
3994 is a semiprime: 2 × 1997, the product of two primes.