It is: 9
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The HCF of the given three numbers is 9 and because the digital sum of the given numbers equals 9 then the numbers are all divisible by 9
The hcf is 12
The GCF/HCF of 486 and 405 is 81.
No, 18 is not a factor of 81.
The greatest common factor of 36, 81 and 18 is 9