Solution:

40

Explanation
The number 40 (Forty) is the only number in one million numbers whose letters are arranged in the order they are arranged in English alphabets as well.

Solution:

If you analyze the numbers and arrange them alphabetically, you will find that the number 8 (eight) will be the first one to occur and number 2202 (two thousand two hundred and two) will be the last one.

Solution:

There is only one possible shape i.e. a cone.

Solution:

204

Solution:

Belgium, Chile, Fiji, Egypt

Solution:

Forty

Solution:

12,345,678,987,654,321

(its amazing and awesome)

Solution:

An autobiography

Solution:

1,2, & 3

1 x 2 x 3 = 6 and 1 + 2 + 3 = 6

Solution:

There is no smoke with an electric train.