The number 1994
1994 is a composite number with 4 divisors. Its prime factorisation is 2 × 997. Divisors (4): 1, 2, 997, 1994.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 1994: a semiprime: 2 × 997, the product of two primes.
- 2
1994 is composite. Its prime factorisation is
- 3
The divisors add up to 2994; without 1994 itself that is 1000, so 1994 is deficient (1000 is less than 1994). Euler's totient φ(1994) = 996 numbers up to 1994 share no factor with it.
- 4
The digits of 1994 add up to 23, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 50 steps to reach 1.
LaTeX source of the formulas on this page
\[ 1994 = 2 \times 997 \]
1994 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 2994 |
| Euler totient φ(n) | 996 |
| Square | 3976036 |
| Cube | 7928215784 |
| Square root | 44.654227 |
| Digit sum / digital root | 23 / 5 |
| Collatz steps to 1 | 50 |
| Scientific notation | 1.994 × |
1994 in other forms
| Form | Value |
|---|---|
| In words | one thousand nine hundred and ninety-four |
| Roman numerals | MCMXCIV |
| Binary (base 2) | 11111001010 |
| Octal (base 8) | 3712 |
| Hexadecimal (base 16) | 7CA |
| Base 3 | 2201212 |
| As time | 1994 seconds = 33 min 14 s |
Is 1994 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (1994 ÷ 2 = 997) | 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 5) | 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 3) | 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 1994 a prime number?
No. 1994 = 2 × 997, so it is divisible by 2.
What are the factors of 1994?
1, 2, 997, 1994.
What is 1994 in binary?
11111001010 (hexadecimal 7CA, octal 3712).
What is the square root of 1994?
About 44.6542.
What is 1994 in Roman numerals?
MCMXCIV.
Is 1994 divisible by 3?
No. Its digits add up to 23, which is not a multiple of 3.
What is special about the number 1994?
1994 is a semiprime: 2 × 997, the product of two primes.