It's about one-six-thousandth the number of Books in the Library of Congress (2013).
In other words, 3,900 is 0.00016530981 times the count of Books in the Library of Congress (2013), and the count of Books in the Library of Congress (2013) is 6,049.2478 times that amount.(2013 figures) (total of books only)
As of September, 2013, The Library of Congress had 23,592,066 books in its catalog and a total of 158,007,115 physical items.
It's about one-ten-thousandth the number of people in The State of California.
In other words, 3,900 is 0.0001017 times the count of people in The State of California, and the count of people in The State of California is 9,833 times that amount.(2014 figures) (Department of Finance estimate)
California, the most populous state in the United States, is home to 38,340,000 people (larger than the population of the entire country of Canada, with 35,540,419 people). Over ten percent of the population — 3,904,657 people — reside in the city of Los Angeles.
It's about one-fifteen-thousandth the number of Copies of Michael Jackson's Thriller Sold (2011).
In other words, the count of Copies of Michael Jackson's Thriller Sold (2011) is 17,000 times 3,900.(sales figures as of 2011) (1982 release)
Michael Jackson's Thriller, the best-selling album of all time, has sold 65 million copies since its release. Following its release in 1982, the album — which contains hits like "Thriller," "Beat It," and "Billie Jean" — won eight (8) Grammy Awards in 1984.
It's about one-twenty-thousandth the number of Copies of Wii Sports Sold.
In other words, 3,900 is 0.00004716 times the count of Copies of Wii Sports Sold, and the count of Copies of Wii Sports Sold is 21,200 times that amount.(a.k.a. Wii スポーツ, a.k.a. Wi Supotsu) (2006 edition) (sales figures as of March 31, 2015)
Wii Sports, the version that was bundled with the original Wii console, has sold 82.69 million units as of March, 2015.
It's about one-fifty-thousandth the number of Copies of Charles Dickens' A Tale of Two Cities Sold.
In other words, the count of Copies of Charles Dickens' A Tale of Two Cities Sold is 50,000 times 3,900.(figures as of 2015)
First published in 1859, Charles Dickens' A Tale of Two CIties is the best-selling novel of all time, for which complete sales figures are available, having sold an estimates 200 million copies. The novel itself contains 135,420 words.
It's about one-three-hundred-fifty-thousandth the number of Users on Facebook.
In other words, 3,900 is 0.00000271 times the count of Users on Facebook, and the count of Users on Facebook is 369,000 times that amount.(March, 2015 figures) (monthly active users)
Facebook had 1.44 billion active users for the month ending March, 2015. In August, 2014, Facebook began a process of removing 87 million accounts that it had found to be fake.
It's about 0.0000002 times the number of Chickens in the World.
In other words, 3,900 is 0.00000021 times the count of Chickens in the World, and the count of Chickens in the World is 4,800,000 times that amount.(a.k.a. fowl) (Gallus gallus domesticus) (2011 figures) (average population)
The most numerous domesticated animals in the world, the estimated average population of chickens worldwide is 19 billion animals. Of these, about 6.4 billion birds produce the world's supply of chicken eggs.