392

392 = 2 x 2 x 2 x 7 x 7.

392 is 112112 in base 3. It is 242 in base 13 and 161 in base 17.

392 has a representation as a sum of two squares: 392 = 14² + 14².

392 is the number of ways of making change for 53 cents using coins of 1, 2, 5, 10 cents (A000008).

4³⁹² + 3 is prime.

392 is a Harshad number and a Kaprekar constant in base 5.

Source: Prime Curios!

63

63 = 3² x 7.

63 = 6² + 3³ = 2⁶ – 1.

63 is the smallest number such that the common alphabetical value of its representation in Roman numerals is equal to itself: LXIII -- 12 + 24 + 9 + 9 + 9 = 63.

63 is a Harshad (or Niven) number; that is, it is divisible by the sum of its digits.

63 is the number of partially ordered sets of 5 elements.

63 is 333 in base 4.

M63 is a galaxy, known as the Sunflower Galaxy, in the constellation Canes Venatici.

Source: Number Gossip