747400

The identifier "747400" is commonly associated with the **International Standard Book Number (ISBN)** system, specifically as a prefix for certain ISBN-10 codes. ISBNs are unique numeric labels assigned to books and book-like publications to identify publishers, titles, and editions. The prefix "747400" is linked to **Hachette Livre**, a major French publishing group, which uses it for its English-language titles distributed in the United States and Canada.

Originally, ISBNs were structured as a 10-digit code, where the first few digits identified the publisher, the next digits specified the title, and the final digit served as a check digit for validation. The "747400" prefix was part of the **ISBN Group 7** block, which was allocated to publishers in the United States and Canada. Over time, ISBNs transitioned to the **ISBN-13** format, a 13-digit barcoded standard, though ISBN-10 remains in use for some legacy titles.

Beyond publishing, "747400" has no widely recognized significance in other fields such as telecommunications, aviation, or military codes. It does not correspond to a specific model number, aircraft registration, or other standardized identifiers. If encountered in a non-publishing context, it may be a random or arbitrary sequence rather than a standardized code.

For accurate identification of a book or publisher, verifying the full ISBN or using a database like the **International ISBN Agency** is recommended. The transition to ISBN-13 has made older ISBN-10 prefixes like "747400" less common in new publications, though they persist in existing catalogs.