4 (number)

natural number

The number four is a number and a numeral. It comes after the number three, and before the number five. In Roman numerals, it is IV.

← 3 4 5 →
-1 0 1 2 3 4 5 6 7 8 9
Cardinalfour
Ordinal4th
(fourth)
Numeral systemquaternary
Factorization22
Divisors1, 2, 4
Greek numeralΔ´
Roman numeralIV
Roman numeral (unicode)Ⅳ, ⅳ
Greek prefixtetra-
Latin prefixquadri-/quadr-
Binary1002
Ternary113
Quaternary104
Quinary45
Senary46
Octal48
Duodecimal412
Hexadecimal416
Vigesimal420
Base 36436
Greekδ (or Δ)
Arabic٤,4
Persian۴
Urdu
Ge'ez
Bengali
Chinese numeral四,亖,肆
Korean넷,사
Devanagari
Telugu
Malayalam
Tamil
Hebrewארבע (Arba, pronounced AR-bah) or ד (Dalet, 4th letter of the Hebrew alphabet)
Khmer
Thai
Kannada
Pronunciation of the number 4

Mathematics change

In mathematics, the number four is an even number and the smallest composite number. Four is also the second square number after one. A small minority of people have four fingers on each hand and four toes on each foot.[source?] Four squared is 16, and four doubled is 8.

In geometry, quadrilaterals or tetragons are a kind of shapes called polygons have four sides and vertices, to which squares are quadrilaterals with sides of same length and vertices of the same wideness.