"Mercy" by Kanye West featuring Big Sean, Pusha-T, 2 Chainz, which climbed to #15 last week, tops the 1 million mark. The song reached #1 on the Hot R&B/Hip-Hop Songs chart last week.
I doesn't look like it'll crossover to pop now. It could've easily been top 10 otherwize.
Nonetheless, it's incredible how Mercy is doing better in the charts with very little pop support than a lot of songs with massive pop support have done recently.