The sum of all the digits of the natural number n is 1994, so when the value of n is the smallest, it is () digits and ()

The sum of all the digits of the natural number n is 1994, so when the value of n is the smallest, it is () digits and ()

Because n is required to be the minimum number, the number of other digits should be 9 except the maximum number, so 1994 / 9 = 221 plus 5,
So "if the sum of all the digits of natural number n is 1994, then when the value of n is the smallest, it is (222) digits and the individual digit is (9)"