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_1839 ( "No. in series" real, "No. in season" real, "Title" text, "Directed by" text, "Written by" text, "Original air date" text, "Production code" text, "U.S. viewers (million)" text )

### Question ###
How many episodes by different writers were seen by 3.24 million people in the US?

### Accurate SQL ###

SELECT COUNT("Written by") FROM table_1839 WHERE "U.S. viewers (million)" = '3.24'