But the first three digits are 978, which can be regarded as ISBN book code, that is, book code.
The last 10 digit belongs to the international standard book number and can be divided into three number segments.
7 107 190056 can be divided into three sections.
The first digit field is the area code, which consists of 1~5 digits, and 7 stands for China publications.
The second paragraph number is the publishing house code, which is assigned by the ISBN center of the country or region to which it belongs, and the allowable value range is 2~5 digits. The bigger the publishing house, the more books it publishes, and the smaller the number.
The book serial number (title identifier) is given by the publishing house itself, and the book serial number of each publishing house is fixed. The shortest one and the longest six. The bigger the publishing house, the more books published and the longer the serial number.
The tenth digit is the parity bit of the electronic computer. Fixed one digit, automatically generated by the first twelve digits.