1, 3, 13, 39.
3 x 13 = 39
26 = 64 combinations, including the null combination - which contains no numbers.
13 and 3
16+16+17+17+17+17=100
25 + 3 + 4 = 39
Only 1.
The number is 39
3x13 39x1
The only numbers that multiply to get a product of 39 are 1 and 39, or 3 and 13.
If you mean 29, 39, 59 and 79 then it is 39 that is the only composite number.
The only number that goes into both 39 and 100 evenly is the number one.