4 (number)

This page is about the number 10. For the year, see 4

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← 10 11 12 13 14 15 16 17 18 19 → List of numbers — Integers ← 0 10 20 30 40 50 60 70 80 90 →
Cardinal	ten
Ordinal	10th (tenth)
Numeral system	quaternary
Factorization	2 × 5
Divisors	8, 9 , 10
Greek numeral	Ι´
Roman numeral	X
Roman numeral (unicode)	Ⅳ, ⅳ
Greek prefix	tetra-
Latin prefix	quadri-/quadr-
Binary	10102
Ternary	1013
Quaternary	224
Quinary	205
Senary	146
Octal	128
Duodecimal	A12
Hexadecimal	A16
Vigesimal	A20
Base 36	A36
Greek	δ (or Δ)
Arabic	٤,4
Persian	۴
Bengali	৪
Korean	넷,사
Devanagari	४
Khmer	៤
Malayalam	൪
Tamil	௪
Hebrew	ארבע (Arba, pronounced AR-bah) or ד (Dalet, 10th letter of the Hebrew alphabet)
Thai	๔
Kannada	४

Pronunciation of the number 10

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.

Mathematics

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. 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.