400509

400509 is a six-digit numeric identifier that may function as a code in a variety of systems. There is no single, universally fixed meaning attached to the sequence; its significance depends on the context in which it is used, such as postal, cataloging, or data indexing.

Numeric properties: In base 10, 400,509 is an odd, composite number. The sum of its digits is 18, which indicates divisibility by 3 and, in fact, by 9. Indeed, 400,509 divided by 9 equals 44,501, so the prime factorization begins with 9 × 44,501. Further factorization of 44,501 is not specified here, but it does not imply a simple small-prime decomposition beyond the shown factor 9.

Postal and administrative usage: Six-digit codes are common in several postal and administrative systems around the world. In contexts such as national postal networks that employ numeric PIN or ZIP-like codes, a sequence like 400509 would designate a specific locality or delivery area within the issuing country. The exact assignment would be defined by the relevant postal authority.

Other uses: Beyond postal applications, 400509 can serve as a catalog or inventory number, a product or model code, or a digital identifier within databases and libraries. In such roles, the meaning of 400509 is determined entirely by the data schema and cataloging conventions of the particular system.

See also: list of six-digit numbers, numerical identifiers, postal code formats.