The number 694
694 is a composite number with 4 divisors. Its prime factorisation is 2 × 347. Divisors (4): 1, 2, 347, 694.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 694: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 2 × 347, the product of two primes.
- 2
694 is composite. Its prime factorisation is
- 3
The divisors add up to 1044; without 694 itself that is 350, so 694 is deficient (350 is less than 694). Euler's totient φ(694) = 346 numbers up to 694 share no factor with it.
- 4
The digits of 694 add up to 19, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 126 steps to reach 1.
LaTeX source of the formulas on this page
\[ 694 = 2 \times 347 \]
694 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 1044 |
| Euler totient φ(n) | 346 |
| Square | 481636 |
| Cube | 334255384 |
| Square root | 26.343880 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 126 |
| Scientific notation | 6.94 × |
694 in other forms
| Form | Value |
|---|---|
| In words | six hundred and ninety-four |
| Roman numerals | DCXCIV |
| Binary (base 2) | 1010110110 |
| Octal (base 8) | 1266 |
| Hexadecimal (base 16) | 2B6 |
| Base 3 | 221201 |
| As time | 694 seconds = 11 min 34 s |
Is 694 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (694 ÷ 2 = 347) | 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 1) | 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 6) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 1) | 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 694 a prime number?
No. 694 = 2 × 347, so it is divisible by 2.
What are the factors of 694?
1, 2, 347, 694.
What is 694 in binary?
1010110110 (hexadecimal 2B6, octal 1266).
What is the square root of 694?
About 26.3439.
What is 694 in Roman numerals?
DCXCIV.
Is 694 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 694?
694 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 2 × 347, the product of two primes.