How can I write a number in Phython in a scientific format with e-3 or e-6 etc instead of e-4 , e-8

Question

How can I write a number in Phython in a scientific format with e-3 or e-6 etc instead of e-4 , e-8 etc? For example: My number is: 300669500.

Phyton gives me 3.006695e+08

I want 0.3006695e+09

or 300.6695e+06

How do I do that?