339

339 is a natural number that follows 338 and precedes 340. It is a composite number, formed by the product of primes 3 and 113.

In number theory, 339 is a semiprime, since it is the product of two distinct primes. Its positive divisors are 1, 3, 113, and 339. Euler’s totient function yields φ(339) = (3−1)(113−1) = 2×112 = 224.

The sum of the digits of 339 is 3+3+9 = 15, giving a digital root of 6. The number is divisible by 3 but not by 9.

In numeral representations, 339 is written as 101010011 in binary, 0x153 in hexadecimal, and CCCXXXIX in Roman numerals.

In astronomy, 339 Dorothea is a main-belt asteroid designated by the number 339, reflecting the common practice of numbering minor planets in the order of their discovery. The use of 339 appears in various mathematical and scientific contexts as a concrete, verifiable example of a semiprime and a composite integer.