1400

1400 is a natural number that lies between 1399 and 1401. In mathematics, it is even and composite, with prime factorization 2^3 × 5^2 × 7. It is a multiple of 100, 8, and 7, among others, and is a Harshad number in decimal since 1+4+0+0 = 5 and 1400 ÷ 5 = 280. The number ends in two zeros, making it a round number in the decimal system.

In other numeral systems, 1400 is written as 10101111000 in binary, and as 0x578 in hexadecimal. In Roman numerals it is MCD.

As a calendar year, 1400 CE falls in the early 15th century. In Europe it was part of the late Middle Ages; the Gregorian calendar was not yet in general use, and dating often depended on regional systems. Across the world, political and cultural landscapes varied, with the era generally characterized by state formation, trade networks, and artistic and scholarly activity that would later contribute to late medieval and early modern transitions.

In modern usage, 1400 may appear in literature, chronology, or as a model number or code in various domains. The number remains notable to numeracy and historical dating as a representative four-digit figure ending in zeros.