right click with MS Edge: https://www.worldometers.info/world-population/india-population/

Likely the popn will pass 1.4 billion during the 1st half of next month

Bear in mind that its only an estimate; I've seen figures above or below the above link from other sites

I doubt any organisation can give a hindustan popn fig within a reasonable error margin, say within a million. The above link is said to be based on UN figure which is something like 20-30 millions above hindustan official figure. The link below says its undercounted by 50 millions

https://economictimes.indiatimes.com/news/politics-and-nation/census-2011-missed-5-crore-slum-dwellers/articleshow/24025536.cms?from=mdr