Fait général: 2312 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 2312 is the number of series-reduced planted trees with 10 leaves.
Culture générale: 2312 is an unremarkable number.
Date historique: April 30th is the day in 1006 that Supernova SN 1006, the brightest supernova in recorded history, appears in the constellation Lupus.