Fait général: 5958 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 5958 is the number of subsets of {1,2,3,...,16} that have a sum divisible by 11.
Culture générale: 5958 is an unremarkable number.
Date historique: April 23rd is the day in 1955 that the Canadian Labour Congress is formed by the merger of the Trades and Labour Congress of Canada and the Canadian Congress of Labour.