354

354 is a natural number that follows 353 and precedes 355. In prime factorization form, it is 2 × 3 × 59, with eight positive divisors: 1, 2, 3, 6, 59, 118, 177, and 354. Because the sum of its proper divisors is 366, 354 is classified as an abundant number. In various bases, 354 is represented as 101100010 in binary, 0x162 in hexadecimal, and 0o542 in octal. In Roman numerals it is written as CCCLIV.

As a day-of-year index, 354 corresponds to December 20 in common years and December 19 in leap years in the Gregorian calendar.

In historical usage, 354 CE (AD) falls in the 4th century, within the period of the late Roman Empire and early Christian history. The year is used in historical chronology and calendrical calculations.