1 million

mega (M)

7 decimal digits

11110100001001000000_2

2^6×5^6

m | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 1000000 mod m | 0 | 1 | 0 | 0 | 4 | 1 | 0 | 1

1000000 = 10^6 is a perfect 6th power.

1000000 has 3 representations as a sum of 2 squares: 1000000 = 280^2 + 960^2 = 352^2 + 936^2 = 600^2 + 800^2

1000000 is an even number.