According to the query of the national bank account opening line number query network, the line number of the Postal Savings Bank in Mengba Town, Zhenyuan County, Qingyang City, Gansu Province, is 403834800018. The first 3 bits of 403 indicates the bank code of Postal Savings Bank; the 4th to 7th bits of 4348 indicates the city code of Mengba Town, Zhenyuan County, Qingyang City, Gansu Province; the 8th to 11th bits of 0001 indicates the bank number; and the last bit of 8 indicates the check digit.