The only way this can be done with integers is 1 x 7. Obviously there are a whole range of non-integers that can do this e.g. 2 x 3.5 4 x 1.75 14 x 0.5 28 x 0.25 etc but the only whole numbers are 1 x 7.
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The two numbers you multiply together to equal 391 are 17 by 23.
-30
-936
17
-62 and 70