Fait mathématique: 4422 is the maximum value of n so that there exist 5 denominations of stamps so that every postage from 1 to n can be paid for with at most 15 stamps.
Culture générale: 4422 is an uninteresting number.
Date historique: February 8th is the day in 1971 that South Vietnamese ground troops launch an incursion into Laos to try to cut off the Ho Chi Minh trail and stop communist infiltration.