Factor some more

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

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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