That will depend on what way you want your numbers, like if you want the previous whole number. Given that 3 decimal places are shown, using that format, the previous value would be:
999.999
9,899,999
1000000
1000001
it comes after the number 999999
999,999
The number that comes after 9999999 is 10000000. This number represents the next increment after reaching the maximum value of 9999999. In numerical order, the number 10000000 follows after 9999999.
The halfway number is 1/2*(750000 + 1000000) = 1/2*1750000 = 875000
30000 200000 1000000
1000000 is, itself, a whole number.
1000000 1000000 1000000 1000000 1000000 1000000
It is so very simple and quick to get the answer, especially since, IF you need it, you can use the calculator that comes with your computer. But since you are obviously not able to do so, the answer is 2000000.
1000000