19, 998.
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2000.The smallest four-digit number there can be is 1000. So, add 1000 and 1000 to get 2000, then least sum you can get when adding two four-digit numbers.
Greatest = 9,999Smallest = 1,008
1000, 1004, 1008, 1112 and just keep adding four until you get to 9996.
9999
9,999,876 is the greatest seven-digit number using four different digits.