IQ of Stephen Hawking is 160. No, it is 280. Sorry but it's 3,000,000 becomes another debate among people who are much more concerned about celebrities IQ.

Right from Einstein down to Newton and to Lydia Sebastian, this matter remains an unceasing philosophy of the present century. Generally, people want to search the internet and the Quora Q&A platform to justify their intellectual confidence. In fact, Quorans will blow your mind how they already mentioned IQ everywhere. 

More at: https://www.neuroscientia.com/2018/09/iq-of-stephen-hawking.html