General fact: 19475 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 19475 is an unremarkable number.
Trivia: 19475 is an unremarkable number.
Historical date: April 26th is the day in 1981 that Dr. Michael R. Harrison of the University of California, San Francisco Medical Center performs the world's first human open fetal surgery.