Table schema:
CREATE TABLE table_1966992_1 (lga_name VARCHAR, census_2006_population VARCHAR, administrative_capital VARCHAR)

Question: What is the LGA name where the 2006 census population is bigger than 425208.9417698913 and administrative capital is port harcourt?
SQL: SELECT lga_name FROM table_1966992_1 WHERE census_2006_population > 425208.9417698913 AND administrative_capital = "Port Harcourt"