1226

1226 (MCCXXVI) is a natural number that follows 1225 and precedes 1227. In mathematics, it is an even composite number with prime factorization 2 × 613, where 613 is a prime. Its divisors are 1, 2, 613, and 1226; it has four divisors in total. The sum of its positive divisors is 1842, and the sum of its proper divisors is 616. The Euler totient function gives φ(1226) = 612. In other representations, 1226 is written in binary as 10011001010 and in Roman numerals as MCCXXVI.

Historically, 1226 is a year in the 13th century, a period marked by developments across medieval Europe and interactions between monarchies and the papacy. As with many years in this era, regional events would have varied, and precise chronicles depend on local sources. The number 1226 also appears in calendar notation and numbering systems beyond its use as a label for a year, including its mathematical properties and symbolic representations.