The number "1236" is a four-digit integer that follows 1235 and precedes 1237. It is an even number, meaning it is divisible by 2. In mathematics, it can be factored into its prime components, which are 2, 3, and 103, making it a composite number. In historical contexts, the year 1236 is notable for various events, including the Mongol invasion of Eastern Europe. This year marked significant changes in territorial control and cultural exchanges in the regions affected by the invasions, influencing the course of history in Europe and Asia.