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31974 divided by 438 = 73
The GCF of a prime number and a composite number is 1 if the former is not a factor of the latter. 73 is a prime number and 18 is a composite number and 73 is not a factor of 18 because 18 is not divisible by 73. So, GCF(73, 18) = 1.
1, 7, 73, 511.
-972 divided by 18 is -54
18 is divisible by 1, 2, 3, 6, 9, 18.