You would write it out in number form like this 6,000
Just like this:"this number in word form"
You would write it like this 1.0761911
42,700,000
5,400,000
19,900,000
You would write it exactly as in the question.
You would write it as 1,060,000
0.071
1390 written in number form is 1390.Do you mean Roman numerals? Then it would be MCCCXC.
1.02 is already in number form. Assuming in word form was meant: one point zero two.
Writing a number in standard form simply means to express the number in its 'normal' form. Therefore, the way you wrote the number is the standard form for your example. However, one would usually write it with comma separators as: 8,900