Fait mathématique: 2938 is the number of binary rooted trees with 17 vertices.
Culture générale: 2938 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: January 16th is the day in 1605 that the first edition of El ingenioso hidalgo Don Quijote de la Mancha (Book One of Don Quixote) by Miguel de Cervantes is published in Madrid, Spain.