It's about one-tenth the number of Seats in Fenway Park.
In other words, 3,900 is 0.1052 times the count of Seats in Fenway Park, and the count of Seats in Fenway Park is 9.5057 times that amount.(2013 figures; daytime capacity) (a.k.a. The Cathedral of Boston) (Boston, Massachusetts)
Fenway Park, the home of the Boston Red Sox baseball team, can accommodate 37,071 spectators when configured for daytime seating. Fenway Park holds the record for most consecutive sellout games, with a streak of 794 sellouts that ended in 2013. This figure is a dramatic turnaround from the attendance in 1965, which was at times as low as just 500 people.
It's about ten times the number of Vertebrae in a Snake's Body.
In other words, the count of Vertebrae in a Snake's Body is 0.1 times 3,900.(Serpentes) (Approximate)
It's about eleven times the number of Sesame Seeds on a Big Mac bun.
It's about twelve-and-a-half times the number of Manned Flights to Space.
In other words, the count of a Manned Flights to Space is 0.08 times 3,900.(2016 figures) (flights with at least 80km altitude; US, Russia, the Soviet Union, and China)
It's about one-fifteenth the number of Seats in The Colosseum.
In other words, the count of Seats in The Colosseum is 10 times 3,900.(a.k.a. The Coliseum, a.k.a. Flavian Amphitheatre, a.k.a. Amphitheatrum Flavium, a.k.a. Anfiteatro Flavio or Colosseo) (Rome) (estimated)
Built between 70 and 80 AD, The Colosseum was a central attraction of Rome, capable of seating 50,000 spectators for various events including plays, war reenactments, and gladiatorial matches. The structure was estimated to require 100,000 cu. m of stone to construct. It remains the largest amphitheater in the world.
It's about twelve-and-a-half times the number of Beatles Songs.
In other words, the count of Beatles Songs is 0.0794 times 3,900.(a.k.a. The Beatles) (1958 thru 1996)
It's about one-fifteenth the number of Seats in New Yankee Stadium.
In other words, 3,900 is 0.077555 times the count of Seats in New Yankee Stadium, and the count of Seats in New Yankee Stadium is 12.894 times that amount.(2014 figures for 2009 Stadium; seating figures only) (a.k.a. Yankee Stadium, a.k.a. The Stadium, a.k.a. The House that George Built) (South Bronx, New York City, New York)