1233

1233 is a natural number that follows 1232 and precedes 1234. In mathematics it has the prime factorization 3^2 × 137, so it is an odd composite number. Its positive divisors are 1, 3, 9, 137, 411, and 1233. The sum of its proper divisors is 561, making 1233 a deficient number. In base representations, 1233 is 0x4D1 in hexadecimal and 10011010001 in binary, and in Roman numerals it is MCCXXXIII.

As a year, 1233 CE falls in the 13th century, during the medieval period. Under the Julian calendar used at the time, it was not a leap year. The year is part of historical records from various regions, and its significance depends on local chronicles and sources. In general, 1233 serves as an example of a mid-sized composite number in number theory and as a calendar year in medieval history.