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How much is 390?

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It's about two-and-a-half times the number of Moons in our Solar System.
In other words, 390 is 2.67 times the count of Moons in our Solar System, and the count of Moons in our Solar System is 0.375 times that amount.
(2015 figures) (confirmed moons only; dwarf planet satellites not included)
Astronomers and other scientists have confirmed the presence of 146 moons orbiting the major planets of our Solar System. About one third of those moons — 53 — are in orbit around the planet Saturn
It's about three times the number of Union Stations in the United States.
In other words, 390 is 2.89 times the count of Union Stations in the United States, and the count of Union Stations in the United States is 0.346 times that amount.
(a.k.a. Union Terminal; a.k.a. Joint Station; a.k.a. Union Depot) (2016 figures)
It's about three-and-a-half times the number of Elements on the Periodic Table.
In other words, 390 is 3.31 times the count of Elements on the Periodic Table, and the count of Elements on the Periodic Table is 0.302 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 four times the number of Wolves in Yellowstone National Park.
In other words, 390 is 3.75 times the count of Wolves in Yellowstone National Park, and the count of Wolves in Yellowstone National Park is 0.267 times that amount.
(a.k.a. Henihco'oo; a.k.a. Héetíhco'oo) (December 2014 figures; Wyoming Park area)
It's about one-fourth the number of Golf Courses in Florida.
In other words, 390 is 0.2569 times the count of Golf Courses in Florida, and the count of Golf Courses in Florida is 3.893 times that amount.
(2016 figures) (public and private)
It's about four-and-a-half times the number of Keys on a Piano.
In other words, the count of Keys on a Piano is 0.23 times 390.
(Moden layout; A0 to C7)
Most modern keyboards have 88 keys, comprising seven octaves and an additional major third. A full-size, acoustic piano may have as many as 12,000 separate parts.
It's about five-and-a-half times the number of Submarines in the US Navy.
In other words, the count of Submarines in the US Navy is 0.19 times 390.
(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.