9*10^5+5*10^4+2

9 * 10^5 + 0.5 * 10^5 + 0.00002 * 10^5

= 9.50002 * 10^5

However that analysis has a significant figure problem. For example you need
9.00000 * 10^5 for the first number
to get enough accuracy to use .00002
and to the original one significant figure you have 1*10^6