Indeed. It’s typically a pH of 1.

And your body is really good at buffering acids and bases. Once your stomach empties into your small intestine, bicarbonate is released which raises the pH to around 5.5 I believe which is necessary for digestive enzymes to work.

Think you'd be surprised. Coke pH is 2.5, and it seems that ideal human stomach pH is 1.5 to 2.5. Fun fact: you can use Coke to clean your toilets.