Search:

OK, but полтора миллиона is better.


Yes.


Yes.


Absolutely.

In decimal or common fractions, the numerals are always feminine, because of the omitted word «часть» which is feminine.
1/3 — «третья часть» — «одна третья»
2/3 — «две третьих части» — «две...

I think the “rules” (if you can call oddities of colloquial speech “rules”) are a bit more complicated here.

If the integer part is 0, «и» is almost never used. E.g. «0,2 В» is pronounced as «ноль...