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_37863 ( "Local Government Area" text, "Principal town" text, "Land Area (km\u00b2)" real, "Population 2011 census" real, "Density" real )

### Question ###
What is the lowest density of a town with a 13,708 2011 population census ?

### Accurate SQL ###

SELECT MIN("Density") FROM table_37863 WHERE "Population 2011 census" = '13,708'