Fatto generale: 13705 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 13705 is an unremarkable number.
Trivia: 13705 is an uninteresting number.
Data storica: July 9th is the day in 869 that a magnitude 8.6Ms earthquake and subsequent tsunami strikes the area around Sendai in the northern part of Honshu, Japan.