2004

2004 = 2 x 2 x 3 x 167.

2004 has a square with the last three digits the same as the three digits before them: 2004² = 4016016.

2²⁰⁰⁴ + 823 is a prime. It is the smallest prime of the form 2²⁰⁰⁴ + k. The reversal of 2²⁰⁰⁴ is a prime (A057708).

(2004 x 4002) - 1 is a prime.

2004 was a year in which there were five Sundays in the month of February (A119406).

Source: Prime Curios!