Is there an error in the datasheet for the AOZ1284?
It does seem there is a typo in the formula.
And yes, it says in the datasheet electrical characteristics that the switching rate with a 46.6k resistor will be 1 MHz typically, with range of 0.8 to 1.2 MHz, so given the 20% tolerance, the approximation of the frequency is close enough not to include any decimals.