The cross bar in the number 7 is used to make it easier to distinguish from the number 1. When they are written clearly, 7 and 1 do not really look the same, but some people make the serif on top of the 1 too large, and it starts to look like a 7.
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No number is lucky or unlucky: that is simply a superstition.
"Some" is an adjective only when it is describing the noun such as in, "Some people like bicicling." In that instance Some is describing the number of people.
The number of days that are in seven months will vary, depending upon which seven months you are referring to. Some months have 30 days while others have 31; February has 28 or 29 days depending upon whether or not it is a leap year.