There is only one proper common factor of 12 and 38; it is 2.
Mathematicians do not consider 1 to be a proper factor, because it divides everything.
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Twelve
Three
The factors of 2 are 1 and 2. The factors of 12 are 1, 2, 3, 4, 6, and 12.
12
The LCM of the first twelve counting numbers is 27720