Something like Champernowne constant

Number Theory Level 2

On the blackboard, my friend Arbi writes the number 1, 2, 3, and so on. What is the 1 millionth digit that he writes?

Note: Arbi writes so that 12345678910111213141516 and so on. So the 10th digit that he writes is '1', not '10'.

2 8 5 1 9 3 6 4

Excel in math and science