DCCLXXXIX

DCCLXXXIX is the Roman numeral that represents the number 789. It is formed from the symbols D (500), CC (200), LXXX (80), and IX (9). The numeral uses subtractive notation for the final pair, IX, to indicate 9, which is the standard modern form for this value.

As a year, 789 CE falls in the early medieval period. When used to denote a specific year, it appears in chronicles and inscriptions across various regions, but there is no single globally defining event tied to the year itself in every historical tradition. In general, Roman numerals like DCCLXXXIX are still employed today for numbering chapters, lists, monuments, clocks, and other sequences where a classical style is preferred.

From a mathematical perspective, 789 is an odd composite number, equal to 3 × 263, with 263 being a prime number. Its digit sum is 24, making it divisible by 3 but not by 9 or 11, among other small primes.

In modern usage, DCCLXXXIX stands as the conventional Roman-numeral form for 789. Alternative, nonstandard renderings such as DCCLXXXXIX are typically avoided in formal contexts. The numeral appears in contexts that utilize Roman numbering, including educational materials, decorative inscriptions, and historical references.