It is ... wait for it ... NINE!
Chat with our AI personalities
The final sum is 9
The greatest 3-digit number is 999. 9+9+9 = 27 The sum of the greatest 3-digit number is 27.
If the digit sum of a number is 9 then it is divisible by 9
10 9+9+1 = 19 1+9=10
If the digit sum of any number from 1 to 10,000 add up to 9 then that number is divisible by 9 as for example 7641 is divisible by 9 because the final digit sum is 9 and so 7641/9 = 849