518

518 is a natural number that follows 517 and precedes 519. In mathematics, it is an even composite number with prime factors 2, 7, and 37, since 518 = 2 × 7 × 37. It can also be expressed as 14 × 37, and it is a Harshad number in base 10 because it is divisible by the sum of its digits (5 + 1 + 8 = 14), yielding 37.

In common numeral systems, 518 is written as 1000000110 in binary, 0x206 in hexadecimal, and 0o1006 in octal. In Roman numerals, it is DXVIII, and in scientific notation it can be represented as 5.18 × 10^2.

Historically, the year 518 CE is notable for the Byzantine Empire: it marks the death of Emperor Anastasius I and the accession of Justin I, shaping the early transition of imperial leadership in the era.

Geographically, the area code 518 serves parts of northeastern New York, including the Capital District around Albany and surrounding regions. It is used for telephone numbers in that portion of the state.

As a numeric identifier, 518 also appears in various product codes, model numbers, and other labeling. However, there is no single dominant usage beyond its basic numerical and regional associations.