207

207 = 3² x 23.

207 is a number that cannot be written as a sum of three squares.

207 is the smallest possible sum of primes that are formed using each of the digits 1 through 9: 207 = 89 + 61 + 43 + 7 + 5 + 2.

207 has a fourth power where the digits of the first half are a permutation of the digits of the last half: 207⁴ = 1836036801.

The Peugeot 207 is a supermini automobile first produced in 2006.

Source: Number Gossip