Fatto generale: 4338 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 4338 is an unremarkable number.
Trivia: 4338 is a boring number.
Data storica: November 16th is the day in 1938 that LSD is first synthesized by Swiss chemist Dr. Albert Hofmann at the Sandoz Laboratories in Basel, Switzerland.