It's about 60 times the number of Union Stations in the United States.
In other words, 8,400 is 62.2 times the count of Union Stations in the United States, and the count of Union Stations in the United States is 0.0161 times that amount.(a.k.a. Union Terminal; a.k.a. Joint Station; a.k.a. Union Depot) (2016 figures)
Typically shared between multiple railroad companies and stations, there are about 135 "Union Stations" in the United States. Of these, the busiest station is Chicago Union Station, which handles 120,000 passengers each year.
It's about one-seventieth the number of Words in War and Peace.
In other words, 8,400 is 0.0143031 times the count of Words in War and Peace, and the count of Words in War and Peace is 69.9149 times that amount.(1869) (1968 Ann Dunnigan translation, New American Library)
First published in 1869, Leo Tolstoy\'s Tzarist Russian epic, War and Peace contains 587,287 words (in one of the popular English translations). The novel is the seventh-longest novel ever written in a Latin or Cyrillic alphabets.
It's about 70 times the number of Elements on the Periodic Table.
In other words, 8,400 is 71.2 times the count of Elements on the Periodic Table, and the count of Elements on the Periodic Table is 0.014 times that amount.(a.k.a. Periodic Table of the Elements, a.k.a chemical elements) (confirmed elements as of 2016)
From element number one, hydrogen, to element one-hundred eighteen, ununoctium, there are 118 confirmed elements on the Periodic Table. Ninety-four of the elements exist in nature, and the remaining twenty-four have only been synthesized in labs (not having occurred naturally in the time since scientists have begun researching them)
It's about 80 times the number of Wolves in Yellowstone National Park.
In other words, 8,400 is 80.8 times the count of Wolves in Yellowstone National Park, and the count of Wolves in Yellowstone National Park is 0.0124 times that amount.(a.k.a. Henihco'oo; a.k.a. Héetíhco'oo) (December 2014 figures; Wyoming Park area)
As of the 2014 population count, there were 104 wolves living in Yellowstone National Park, in twelve packs. All of the wolves now living in the Park are thought to have descended from the 66 wolves (re)introduced into the Park in 1995-96.
It's about 95 times the number of Keys on a Piano.
It's about 100 times the number of Submarines in the US Navy.
In other words, 8,400 is 120 times the count of Submarines in the US Navy, and the count of Submarines in the US Navy is 0.0083 times that amount.(a.k.a. Subs) (includes all types, all classes) (2015 figures)
The United States Navy maintains a fleet of 72 active submarines. A typical submarine goes to sea with a crew of about 140.
It's about 150 times the number of Countries in Africa.
In other words, the count of Countries in Africa is 0.0063 times 8,400.(2016 figures) (sovereign states recognized by the UN only)
The continent of Africa includes 54 sovereign countries recognized by the United Nations as of 2016. It is the second-most populous continent in the world, with 1.1 billion inhabitants.