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How much is 390?

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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 0.230 times 390.
(Moden layout; A0 to C7)
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 0.190 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.
It's about seven times the number of Countries in Africa.
In other words, 390 is 7.20 times the count of Countries in Africa, and the count of Countries in Africa is 0.140 times that amount.
(2016 figures) (sovereign states recognized by the UN only)
It's about eight times the number of Teeth in a Great White Shark's Mouth.
In other words, 390 is 8.10 times the count of Teeth in a Great White Shark's Mouth, and the count of Teeth in a Great White Shark's Mouth is 0.120 times that amount.
(Carcharodon carcharias) (average; including developing rows)
It's about fourteen times the number of Countries in the European Union.
In other words, the count of Countries in the European Union is 0.071 times 390.
(a.k.a. EU) (2016 figures)
It's about thirty times the number of Living Kings and Queens.
In other words, the count of Living Kings and Queens is 0.038 times 390.
(2015 figures) (distinct Monarchs)
It's about 45 times the number of Symphonies Composed by Beethoven.
In other words, 390 is 43.33333333330 times the count of Symphonies Composed by Beethoven, and the count of Symphonies Composed by Beethoven is 0.0230769230769 times that amount.
(a.k.a. Ludwig van Beethoven)