4 (number)

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3 4 5
−1 0 1 2 3 4 5 6 7 8 9
Cardinal four
Ordinal 4th
(fourth)
Factorization 22
Divisors 1, 2, 4
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
Bengali
Chinese numeral 四,亖,肆
Korean 넷,사
Devanagari
Telugu
Malayalam
Tamil
Hebrew ארבע (Arba, pronounced AR-bah) or ד (Dalet, 4th letter of the Hebrew alphabet)
Khmer
Thai
Kannada
Pronunciation of the number 4

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[change | edit source]

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.