4 (number)

← 3 4 5 →
-1 0 1 2 3 4 5 6 7 8 9 → List of numbers — Integers ← 0 10 20 30 40 50 60 70 80 90 →
Cardinal	four
Ordinal	4th (fourth)
Numeral system	quaternary
Factorization	22
Divisors	1, 2, 4
Greek numeral	Δ´
Roman numeral	IV
Roman numeral (unicode)	Ⅳ, ⅳ
Greek prefix	tetra-
Latin prefix	quadri-/quadr-
Binary	1002
Ternary	113
Quaternary	104
Quinary	45
Senary	46
Octal	48
Duodecimal	412
Hexadecimal	416
Vigesimal	420
Base 36	436
Greek	δ (or Δ)
Arabic	٤,4
Persian	۴
Urdu
Ge'ez	፬
Bengali	৪
Chinese numeral	四，亖，肆
Korean	넷,사
Devanagari	४
Telugu	౪
Malayalam	൪
Tamil	௪
Hebrew	ארבע (Arba, pronounced AR-bah) or ד (Dalet, 4th letter of the Hebrew alphabet)
Khmer	៤
Thai	๔
Kannada	४

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.

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.

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