343

343 is a natural number that follows 342 and precedes 344. It is an odd composite number and the cube of seven (7^3). Because it equals seven multiplied by itself three times, its prime factorization is 7^3.

In decimal notation, 343 is a palindromic number. Its representations in other bases include binary 101010111 and hexadecimal 0x157. In Roman numerals it is CCCXLIII. As a cube of a prime, 343 is not representable as a sum of two squares, since primes congruent to 3 modulo 4 raised to odd powers do not occur in such sums.

In modern culture and technology, the numeral 343 is associated with 343 Industries, the video game developer created by Microsoft to oversee the Halo franchise; the name references the artificial intelligence 343 Guilty Spark from Halo. The number also designates a minor planet, 343 Ariadne, a main-belt asteroid.