Though it's not the all-time record, $400 million is nothing to bat an eye at.
The next drawing will be held Tuesday. Tickets will be sold until 7:45 p.m. Pacific time, with the drawing at 8 p.m.
The jackpot, after taxes, would have an estimated cash value of $224.8 million, according to the California Lottery. The game is played in 43 states, Washington D.C. and the U.S. Virgin Islands.
In December, a winner in Northern California split a $648-million jackpot (the second largest in game history) with a winner in Atlanta.
The store where a winning ticket is sold can receive up to $1 million in winnings depending on the size of the jackpot, virtually assuring that whoever sells the winning ticket on Tuesday will get a seven-figure bonus of their own.
The largest lottery jackpot ever was a Mega Millions drawing in 2012 for $656 million. That prize was split among winners in three states.