The proper factors of 16 are 1,2,4, and 8 :)
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39 is a composite number whose proper factors add up to 16.
2, 3, 4, 6, 8, 12, 16, 24
Those are the proper factors of 96.
Deficient The factors of 16 (excluding itself) are: 1, 2, 8 1+2+8=11 This is less than 16, therefore deficient.
Prime numbers don't have proper factors.