4n or n4
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The number digits for twelve and four-tenths = 12.4
There is no such number. If the four digits are even, the entire number is even, not odd.
(The assumes that "the number" in the question is not n, although if they are they same number, this is still true.) "If the sum of the digits of the number is divisible by n, then the number itself is divisible by n" is true if n is 3 or if n is 9.
9,999,876 is the greatest seven-digit number using four different digits.
36