18561939

18561939 is an eight-digit numeral formed by concatenating the four-digit years 1856 and 1939. It does not denote a widely recognized single entity, but it may appear in historical datasets, archival identifiers, bibliographic codes, or other numerically encoded references.

Possible interpretations include: a lifespan for a person born in 1856 and who died in 1939; a date span indicating a connection between events in those years; a catalog or project code used by libraries, museums, or industry; or a generic numeric key in data processing. If read as a date range, the period would cover the late 19th century through the interwar era, a time of rapid change and global conflict culminating in 1939 with the onset of World War II in Europe.

Numerical properties: as a number, 18561939 is odd and divisible by 3, since the sum of its digits (42) is a multiple of 3. Dividing by 3 yields 6187313; full prime factorization would require further calculation. In practical use, the eight-digit form is more commonly treated as an identifier or concatenation rather than a standard date with separators.