699

699 is a natural number that follows 698 and precedes 700. In mathematics, it is an odd composite number. Its prime factorization is 699 = 3 × 233, with 233 prime, making 699 a semiprime. The sum of its digits is 24, so 699 is divisible by 3 but not by 9. It is not a Harshad (Niven) number in base 10.

In common representations, 699 has several standard forms. In Roman numerals it is DCXCIX; in binary it is 10101110112; in hexadecimal it is 0x2BB; in octal it is 12738. The factor 233 is notable as a Fibonacci number (F13), so 699 equals 3 × F13.

As a number, 699 can also appear as a year designation in historical chronology, referring to events in the year AD 699 or 699 BCE, depending on the era system used. In recreational and number-theory contexts, 699 is often cited as an example of a semiprime composed of a small prime and a larger prime, illustrating properties of prime factorization and base representations.