18518

18518 is a natural number that lies between 18517 and 18519. In arithmetic, it is an even composite number. Its prime factorization is 2 × 9259, and since 9259 is a prime, 18518 is a semiprime.

In astronomy, 18518 is used as the numerical designation of a minor planet in the main asteroid belt. The number reflects the order in which the object was officially cataloged, and many such bodies carry additional names beyond their numerical designation.

In geography and postal systems, 18518 serves as a postal code in Spain. Five-digit Spanish postal codes are used to identify specific areas, towns, or municipalities, and 18518 corresponds to a particular locality within the country’s postal framework.

As a cataloged number, 18518 can also appear in various technical or administrative contexts, such as model numbers, serial identifiers, or inventory listings. Its mathematical properties—being an even semiprime—are the most consistent attribute across different uses.

See also: neighboring numbers 18517 and 18519; lists of semiprimes and minor planets.