Why 1-methylethanol is not preferred IUPAC name for isopropyl alcohol?

For the compound $\ce{CH3-CH(OH)-CH3}$ I propose two names: **propan-2-ol** and **1-methylethanol**. Which is the correct name as per the IUPAC guidelines?


According to *Organic Chemistry* by Morrison and Boyd, the name is given as propan-2-ol. Why is 1-methylethanol not accepted?


