999 - 100 = 899
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It is -987. The smallest positive 3-digit integer with unique digits is 102.
We're talking about 3-digit numbers that you can make out of 3, 5, 7, and 9.-- The biggest one possible is 975.-- The smallest one possible is 357.-- Their difference is 618 .
smallest 8 digit number with three different digits
101
The factors from greatest to least are: 11,11,5,3,3. The smallest prime factor is 3. You can get a quick idea of this by the fact that the digital root (number that goes evenly into the sum off all digits) is 18 which is divisible by 3.