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_53433 ( "Name" text, "Hanzi" text, "Hanyu Pinyin" text, "Uyghur ( UEY )" text, "Uyghur Latin ( ULY )" text, "Population (2010 Census)" text, "Area (km\u00b2)" text, "Density (/km\u00b2)" text )

### Question ###
What is the Hanyu Pinyin with a density of 39.63?

### Accurate SQL ###

SELECT "Hanyu Pinyin" FROM table_53433 WHERE "Density (/km\u00b2)" = '39.63'