7

← 6 7 8 →
−1 0 1 2 3 4 5 6 7 8 9
Cardinalseven
Ordinal7th
(seventh)
Numeral systemseptenary
Factorizationprime
Prime4th
Divisors1, 7
Greek numeralΖ´
Roman numeralVII, vii
Greek prefixhepta-/hept-
Latin prefixseptua-
Binary1112
Ternary213
Senary116
Octal78
Duodecimal712
Hexadecimal716
Greek numeralZ, ζ
Amharic
Arabic, Kurdish, Persian٧
Sindhi, Urdu۷
Bengali
Chinese numeral七, 柒
Devanāgarī
Telugu
Tamil
Hebrewז
Khmer
Thai
Kannada
Malayalam
ArmenianԷ
Babylonian numeral𒐛
Egyptian hieroglyph𓐀
Morse code_ _...

7 (seven) is the natural number following 6 and preceding 8. It is the only prime number preceding a cube.

As an early prime number in the series of positive integers, the number seven has greatly symbolic associations in religion, mythology, superstition and philosophy. The seven classical planets resulted in seven being the number of days in a week.[1] 7 is often considered lucky in Western culture and is often seen as highly symbolic. Unlike Western culture, in Vietnamese culture, the number seven is sometimes considered unlucky.[citation needed]

  1. ^ Carl B. Boyer, A History of Mathematics (1968) p.52, 2nd edn.