444

444 = 2² x 3 x 37.

444⁴⁴⁴ + 5 is prime. Note that 444 is the only known number m such that m^m + 5 is prime.

444 = (4¹ + 4¹+ 4¹) + (4² + 4² + 4²) + (4³ + 4³ + 4³) + (4³ + 4³ + 4³).

In base 6, 444 is 2020.

St. Patrick founded the Irish city of Armagh in the year 444.

Source: Prime Curios!