The number 394
394 is a composite number with 4 divisors. Its prime factorisation is 2 × 197. Divisors (4): 1, 2, 197, 394.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 394: a semiprime: 2 × 197, the product of two primes.
- 2
394 is composite. Its prime factorisation is
- 3
The divisors add up to 594; without 394 itself that is 200, so 394 is deficient (200 is less than 394). Euler's totient φ(394) = 196 numbers up to 394 share no factor with it.
- 4
The digits of 394 add up to 16, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 27 steps to reach 1.
LaTeX source of the formulas on this page
\[ 394 = 2 \times 197 \]
394 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 594 |
| Euler totient φ(n) | 196 |
| Square | 155236 |
| Cube | 61162984 |
| Square root | 19.849433 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 27 |
| Scientific notation | 3.94 × |
394 in other forms
| Form | Value |
|---|---|
| In words | three hundred and ninety-four |
| Roman numerals | CCCXCIV |
| Binary (base 2) | 110001010 |
| Octal (base 8) | 612 |
| Hexadecimal (base 16) | 18A |
| Base 3 | 112121 |
| As time | 394 seconds = 6 min 34 s |
Is 394 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (394 ÷ 2 = 197) | 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 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 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 9) | 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 394 a prime number?
No. 394 = 2 × 197, so it is divisible by 2.
What are the factors of 394?
1, 2, 197, 394.
What is 394 in binary?
110001010 (hexadecimal 18A, octal 612).
What is the square root of 394?
About 19.8494.
What is 394 in Roman numerals?
CCCXCIV.
Is 394 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 394?
394 is a semiprime: 2 × 197, the product of two primes.