529
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you could multiply: 1x490=490 2x245=490 or 10x49=490 you could add: 29+10=39 and so on
93
1 x 39, 3 x 13.
13+13+13=39
399
Defective numbers are when all the factors of a number add up to be smaller than the number.Ex.:39 1+3+13=17 17<39 39 is defective