30 (number)

30 (thirty) is the natural number following 29 and preceding 31.


Cardinal	thirty
Ordinal	thirtieth
Numeral system
Factorization	$2\cdot 3\cdot 5$
Divisors	2, 3, 5, 6, 10, 15
Roman numeral	XXX
Binary	11110
Hexadecimal	1E
Hebrew	ל (Lamed)

In mathematics

It is a primorial as well as the sum of the squares of the integers 1, 2, 3 and 4. It is the first sphenic number and the first Giuga number. It is the sum of the first four squares, which makes it a square pyramidal number. 30 is the largest number such that coprimes smaller than itself are also prime. It is a Harshad number. The Chinese word numeral for thirty is 三十. A polygon with thirty sides is called a tricontagon. Both an icosahedron and a dodecahedron have 30 edges.

In science

The atomic number of zinc

In astronomy,

Messier object M30, a magnitude 8.5 globular cluster in the constellation Pegasus

The New General Catalogue object NGC 30, a double star in the constellation Pegasus

The Saros number of the solar eclipse series which began on -2069 October 2 and ended on -572 March 18. The duration of Saros series 30 was 1496.5 years, and it contained 84 solar eclipses.

The Saros number of the lunar eclipse series which began on -1803 June 19 and ended on -487 August 18. The duration of Saros series 30 was 1316.2 years, and it contained 74 lunar eclipses.

In other fields

30 is:

The house number of 30 St Mary Axe (The Gherkin)
The number of days in the months April, June, September and November.
In years of marriage, the pearl wedding anniversary.
The code for international direct dial phone calls to Greece.
The duration of the Thirty Years' War.
The designation of Interstate 30, a freeway that runs from Texas to Arkansas.
Used to indicate the end of a wire service story.
The number of tracks on The Beatles' eponymous album, usually known as The White Album.
Part of the name of:

Thirty odd foot of grunts, the band fronted by actor Russell Crowe

In the title of the movie 13 Going on 30, starring Jennifer Garner.
In the title of the Food Network show 30 Minute Meals.
Historical years: 30 A.D., 30 B.C., or 1930
The number of cars in the Nintendo 64 game F-Zero X.

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