1390

1390 is a natural number that follows 1389 and precedes 1391. It is also used as a label for years and other identifiers. In Roman numerals it is written as MCCCXC. In binary it is 10101101110, and in hexadecimal it is 0x56E.

Mathematically, 1390 is even and composite. Its prime factorization is 2 × 5 × 139, giving it eight divisors: 1, 2, 5, 10, 139, 278, 695, and 1390. The number is square-free, since no prime appears with exponent greater than one. Euler’s totient function yields φ(1390) = 552. In power-of-two sums or other common representations, 1390 equates to these base forms and can be used in various arithmetic contexts.

In calendar use, 1390 AD falls in the late Middle Ages. During this period, Europe experienced ongoing feudal and royal power dynamics within the broader frame of the Hundred Years’ War, while various Asian polities, including the Timurid realm, were expanding their influence. The year sits among a era of regional realignments, trade networks, and cultural developments that characterized the late 14th century.

Other uses of the number 1390 may appear in cataloging, numbering systems, or model identifiers. As a numeral, it is one of many integers used across disciplines to denote quantities, years, and classifications. See also the 1390s decade for broader historical context or 1390 (year) in calendar-based references.