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curl-6 said:

Namco Bandai confirms Taiko no Tatsujin Drum 'n' fun has shipped a million copies.

https://gonintendo.com/stories/364333-taiko-no-tatsujin-drum-n-fun-surpasses-1-million-units-shipped

So considering it's charting this week (#29) and shows 486k total sales there, I'd say it's safe o assume that at least half of the copies were digital ones.