Wordpress get category main name

So if I'm on a subcategory page...how can I get the name of the main category? S开发者_JS百科o let's say I'm on site.com /my-category/my-subcategory/ so how can I get "my-category" ? I don't want to parse the url :) cuz' I think wordpress has a built in function or smth.

I've solved this by using get_the_category()) and ->category_parent