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4 (number)



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3 4 5
−1 0 1 2 3 4 5 6 7 8 9
Cardinalfour
Ordinal4th
(fourth)
Factorization22
Divisors1, 2, 4
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

File:En-us-Four.ogg

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 and four toes, on each hand and foot, respectively. This proves difficult to count on your fingers. Four squared is 16, and four doubled is 8.