30 (number)

From Academic Kids

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

List of numbersIntegers

<< 30 31 32 33 34 35 36 37 38 39 >>

Cardinalthirty
Ordinalthirtieth
Numeral system
Factorization<math>2\cdot 3\cdot 5<math>
Divisors2, 3, 5, 6, 10, 15
Roman numeralXXX
Binary11110
Hexadecimal1E
Hebrewל (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 astronomy

In other fields

Thirty is:

es:Treinta eo:Tridek fr:30 (nombre) ko:30 ia:30 it:Trenta nl:30 (getal) ja:30 no:30 (tall) pt:Trinta sl:30 (število) sv:30 (tal) zh:30

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