WhatsApp has 400m MAUs in India

"Messaging service WhatsApp has been in the middle of a number of controversies since last year, ranging from the proliferation of fake news to storing data locally, even as it looks to expand into digital payments.
These controversies come at a time when its parent company Facebook, which also owns Instagram and Messenger, has been under scrutiny across the world over privacy of user data, and also agreed to pay a $5-billion fine to US regulators earlier this week. But even as it tackles these challenges, WhatsApp is bullish on prospects in India as it revealed that it has 400 million monthly active users here out of a global base of 1.5 billion."

Source:  Economic Times, 26th July 2019