Hecho matemático: 2484 is the number of regions the complex plane is cut into by drawing lines between all pairs of 18^{th} roots of unity.
Trivia: 2484 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fecha histórica: October 19th is the day in 1900 that Max Planck, in his house at Grunewald, on the outskirts of Berlin, discovers the law of black body emission (Planck's law).