Below is an instruction that describes a task. Write a response that appropriately completes the request.

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

### Inputs:
table_name: table, columns: ['Name', 'Hanzi', 'Hanyu Pinyin', 'Uyghur ( UEY )', 'Uyghur Latin ( ULY )', 'Population (2010 Census)', 'Area (km²)', 'Density (/km²)']

### Response:
SELECT Hanyu Pinyin FROM table WHERE Density (/km²) = 39.63