It depends on what you want to study in management. Some research will require a heavier background in math (e.g., finance), while others will be more psychology or sociology (e.g., OB). I'm not sure where entrepreneurship or international business fall, but a lot of schools generally lump those with OB departments so I assume they're more social science.
If you're more interested in the social science part of business I would recommend stats classes over math. Math classes will give you a better foundation for stats but could be overkill for the level of stats you'll need to be successful.
With what you shared you should be fine getting into a decent program. I would recommend not emphasizing your desire to teach too much in your applications. The goal of most PhD programs is to develop researchers. There are a few programs out there that have classes on teaching (U Washington comes to mind) but they are rare.