1 Chronicles 21:5
And Joab gave the sum of the number of the people unto David. And all they of Israel were a thousand thousand and an hundred thousand men that drew sword: and Judah was four hundred threescore and ten thousand men that drew sword. (1 Chronicles 21:5)
Joab gave the sum.
 The totals given here differ somewhat from the totals in 2 Sam. 24:9. These totals are as follows:
  Chronicles Samuel
Israel 1,100,000 800,000
Judah 470,000 500,000
Total 1,570,000 1,300,000
 It is possible that the figure in Chronicles of 1,100,000 includes the total of David’s standing army, 288,000 men (ch. 27:1-15). In round numbers this would be 300,000 men, which, added to the 800,000 of Samuel, would make 1,100,000. The 500,000 of Samuel for Judah may also be a round number for the chronicler’s more exact figure of 470,000 (see further on 2 Sam. 24:9). The number of warriors in Israel had increased considerably since the Exodus, when the total, excluding Levites, stood at 603,550 (Num. 1:46). See Introduction to Chronicles.