Are you ready to have your mind blown? No, seriously, this will make you doubt we live in a logical, rational world.
Ready? (I suggest you tie something around your head. Messy.)
J.R.R.Tolkien died in 1973. Reverse those numbers, and you get 3791.
Look familiar?
Three Rings for the Elven-kings under the sky,
Seven for the Dwarf-lords in their halls of stone,
Nine for Mortal Men doomed to die,
One for the Dark Lord on his dark throne
Yeah. And he wrote that in 1937.