338

338 = 2 x 13 x 13.

338 is the last integer for which the number of divisors (6) and the sum of its prime factors (2 + 13 + 13 = 28) are both perfect numbers.

338 is 2323 in base 5 and 242 in base 12.

338 has two representations as a sum of two squares: 338 = 7² + 17² = 13² + 13².

338 is a divisor of 99⁴ - 1.

338³ = 38,614,472 = (386 + 1 - 4 - 47 + 2)³.

Source: Prime Curios!