2399

2399 is a natural number that follows 2398 and precedes 2400. In mathematics, it is a prime number and an odd integer. Its Roman numeral representation is MMCCCXCIX.

In calendar terms, 2399 AD is a year in the 24th century of the Gregorian calendar. It is a common year, not a leap year, and thus contains 365 days.

Culturally, the year 2399 is frequently used in speculative fiction as a distant future setting. Authors and creators use this horizon to explore themes such as space exploration, interstellar governance, technological advancement, and the ethical implications of artificial intelligence and automation. As a distant-yet-plausible future, 2399 serves as a flexible backdrop for worldbuilding across science fiction genres.

Numerically, 2399 is part of the base-10 system and can be represented in other bases as needed for mathematical or computational purposes. Its status as a prime number and its position within the sequence of natural numbers make it a standard example in discussions of number theory and arithmetic.