A megahertz is one million (or 106) hertz. See hertz, kilohertz (one thousand hertz), gigahertz[?] (109 hertz), terahertz[?] (1012 hertz), and petahertz[?] (1015 hertz).
... householder with no husband present, and 16.2% are non-families. 12.0% of all households are made up of individuals and 3.4% have someone living alone who is 65 years of ...