It could be: 4760 = 1
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The least 4-digit number you can make with the digits 4, 7, 6, and 0 is 4067. To form the smallest number, you should start with the smallest non-zero digit, which is 4, followed by the next smallest digits arranged in ascending order.
By rearranging the digits, it is 9861.
The highest number you can make out of the digits 2 4 0 and 1 is 4210.
If that is the only criteria then the lowest number is 456789, what you allready have.
9876 is the largest four digit number you can make if all the digits must be different.