4 (number) (original) (raw)
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This page is about the number 4. For the year, see 4
| ← 3 4 5 → | |
|---|---|
| -1 0 1 2 3 4 5 6 7 8 9 → List of numbers — Integers ← 0 10 20 30 40 50 60 70 80 90 → | |
| Cardinal | four |
| Ordinal | 4th(fourth) |
| Numeral system | quaternary |
| Factorization | 22 |
| Divisors | 1, 2, 4 |
| Greek numeral | Δ´ |
| 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 | ፬ |
| Bengali | ৪ |
| Chinese numeral | 四，亖，肆 |
| Korean | 넷,사 |
| Devanagari | ४ |
| Telugu | ౪ |
| Malayalam | ൪ |
| Tamil | ௪ |
| Hebrew | ארבע (Arba, pronounced AR-bah) or ד (Dalet, 4th letter of the Hebrew alphabet) |
| Khmer | ៤ |
| Thai | ๔ |
| Kannada | ४ |
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.[_source?_] 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.