354

354 = 2 x 3 x 59.

354 is the sum of the first four fourth powers: 354 = 1⁴ + 2⁴ + 3⁴ + 4⁴.

354 is the smallest number whose first two digits are distinct odd primes and whose third digit is the arithmetic mean of the first two.

354 is the sum of two triangular numbers in exactly two ways: 354 = 351 + 3 = 276 + 78.

354 is the average number of days in a lunar year (rounded off).

Source: Number Gossip