# 3 (number)

 ← 2 3 4 →
Cardinal three
Ordinal 3rd
(third)
Numeral system ternary
Factorization prime
Divisors 1, 3
Roman numeral III
Roman numeral (unicode) Ⅲ, ⅲ
Greek prefix tri-
Latin prefix tre-/ter-
Binary 112
Ternary 103
Quaternary 34
Quinary 35
Senary 36
Octal 38
Duodecimal 312
Vigesimal 320
Base 36 336
Arabic ٣,3
Urdu
Bengali
Chinese 三，弎，叁
Devanāgarī
Ge'ez
Greek γ (or Γ)
Hebrew ג
Japanese
Khmer
Korean 셋,삼
Malayalam
Tamil
Telugu
Thai
Pronunciation of the number 3

The number three (3) is one more than two and one less than four. It is the first Mersenne prime. Three is an important number for many cultures (groups of people living together). It is also a prime number. It is the first odd prime. In Roman numerals, it is III. It is the only prime that p and ${\displaystyle p-1}$ are both prime.