You need at least two numbers to find a GCF.
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The highest common factor (HCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question! The highest factor of any number is itself.
It is: 9
The GCF/HCF of 486 and 405 is 81.
hcf = 4 and lcm = 420
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