\[\large 191\:902 = 438\cdot 439 - 19\cdot 20.\]

Based on this fact, find two factors \(x, y\) such that \[191\:902 = x\cdot y \\ x > y > 400\] Submit your answer by concatenating \(x\) and \(y\). For instance, if \(x = 323\) and \(y = 176\), submit "323176".

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