Is it legal for a company to pay me less then minimum wage based on 45 hours a week worked? Right now I'm making under $400/week at $19,000 a year. The minimum wage in Oregon is $8.40/hour. On salary I'm making 8.11 hour. Is this legal? What about getting overtime?

Actually yes it is illegal, there is a national ( federal) min wage for salary.
I believe it is @ 24 to 26 thousand a year. If you are not being paid that much as a salary amount, they have to pay you overtime pay.

there is a national ( federal) min wage for salary.
I'm having a hard time finding any information about this federal min wage for salary. Could someone please provide a link to a resource stating this as fact?