Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_2639433_4 (market_share__overall_ VARCHAR, viewers__in_millions_overall_ VARCHAR)

### Question ###
If the overall viewers were 1.83 millions, what was the overall market share?

### Accurate SQL ###

SELECT market_share__overall_ FROM table_2639433_4 WHERE viewers__in_millions_overall_ = "1.83"