There is only one and it is 1
Since 13 is a factor of 39, all of its factors are common.
The common factors of 50 and 98 are: 1 and 2
1,2,7 and 14 are the common factors of 98 and 140.
The common factors of 13 and 39 are: 1 and 13
The common factors of 39 and 91 are: 1 and 13
The common factors of 27 and 39 are 1 and 3
Any of 39's factors can be common.
The common factors of 51 and 39 are 1 and 3.
The common factors of 98 and 14 are: 1, 2, 7, and 14
The factors of 39 are 1, 3, 13, and 39. The factors of 65 are 1, 5, 13, and 65. The common factors are 1 and 13.
The factors of 15 are: 1, 3, 5, 15.The factors of 39 are: 1, 3, 13, 39.The common factors are: 1, 3.
The factors of 39 are 1, 3, 13, 39 For them to be common, they need to be compared to another set of factors.