234

234 = 2 x 3² x 13.

234 has a representation as a sum of two squares: 234 = 3² + 15².

234 is a triangular matchstick number.

234 is a solution to the postage stamp problem with four denominations and eight stamps.

There are 234 ways to stack 12 pennies in a line so that each penny lies on the table or on two pennies.

234 is the atomic mass number of the rare, but naturally occurring, radioactive isotope uranium-234.

Source: What’s Special about This Number?