Factors of 4: 1, 2, 4
Factors of 9: 1, 3, 9
Factors of 16: 1, 2, 4, 8, 16
GCF (4, 9, 16) = 1
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Well, honey, the greatest common factor of 19 and 16 is 1. They don't have any other factors in common besides that lonely little number 1. So, there you have it - the not-so-exciting but technically correct answer.
19 is the greatest common factor. 19/19=1, 76/19=4.
19
The greatest common factor of 874 , 1995 = 19
The greatest common factor is 19