i think a math major can do most anything afterwards, and maybe do it better thah most. i have heard for example that physics majors are favored in med school acceptances.
there is a reason for this - physics majors know how to reason and solve problems.
i think the same applies to successful math majors.
thinking skills are prized in maths and this makes math majors good at whatever they choose to do that has a reasoning aspect to it.
just a guess as i myself stayed in the fold, i teach and do math. but my wife was a math major and is a crackerjack doctor, and our older son was a math major and is a successful internet soft and hardware guru.
our other son scored higher than me on SAT math, and is a talented artist and English teacher and was briefly a semi - pro basketball player.