Fait mathématique: 4619 is a value of n for which 4n and 5n together use each digit exactly once.
Culture générale: 4619 is a boring number.
Date historique: August 23rd is the day in 2006 that Natascha Kampusch, who had been abducted at the age of 10, managed to escape from her captor Wolfgang Priklopil, after 8 years of captivity.