500 000 written as a power?
example: three to the power of two... etc
500,000 as a power can be written as 5 x 10^5.You can get some assistance from http://www.algebra.com as you will be required to specify the exponents to be able to express this.
5 X 10^5
In scientific notation, it is 5.0 * 10^5. Is that what you meant, or did you really want it written as a power? Because I don't know what base and exponent to choose.