1366

1366 is an integer that follows 1365 and precedes 1367. In mathematics, it is an even composite number with prime factorization 2 × 683, where 683 is prime. It is not a perfect square; the nearest squares are 1296 (36^2) and 1369 (37^2). The Euler totient of 1366 is 682. In binary, 1366 is 10101010110, and in Roman numerals it is written as MCCCLXVI.

In calendar use, 1366 CE is a year in the 14th century of the Common Era. It falls within the Late Middle Ages in European history and corresponds to a period with varied regional events across different regions of the world.

In computing and display technology, 1366×768 is a common display resolution, often described as HD+ and widely found on budget laptops and some desktop monitors. The total pixel count for this resolution is 1,049,088, and it typically has an aspect ratio close to 16:9.

The number 1366 also appears in standard references as a part of sequences, cataloging, and as a convenient example of a composite number with a simple prime factorization. As with many four-digit integers, it serves as a practical unit in demonstrations of arithmetic, numeral systems, and digital display measurements.