Her previous albums to top that mark were "1989", which sold 1.29 million in 2014, "Red" (1.21 million in 2012) and "Speak Now" (1.05 million in 2010).
Reputation, which is the 27-year-old Swift's sixth studio album, is also her fourth to sell a million copies in a week.
While Swift's numbers are impressive, they are dwarfed by the biggest debut in music history: Adele's "25" sold 2.3 million copies in its first three days before ending its first week with 3.3 million copies sold in 2015.
Swift's latest bolted out of the gate Friday with sales of more than 700,000 copies in the first 24 hours, Nielsen reported, and it had reached 925,000 by the end of Sunday. One clever fan even wrapped a stuffed snake around her neck as she posed with her copy of Reputation, a winking reference to the insult Swift has reappropriated as her own symbol.
Tickets for general public go on sale December 13. Her Instagram account now features two lines of images showing positive comments from reviewers all written in that recognizable Reputation gothic print.
I'm sorry, Taylor Swift can't come to the phone right now. Why? And it's on the house.