39433

9875

I got this number by making the last digit odd and the first three digits the highest numbers.

9876

I got this number by doing the same as the first but instead of the last digit being odd it is even number.

9900

I got this number by finding the highest one digit number if you times it by three and added nine hundred.

1000

I got this number by timesing five times two and adding two zeros.

4999

I got this number by using the number before 5000