The number "429" is a three-digit integer that follows 428 and precedes 430. It is an odd number and can be expressed as the sum of two prime numbers, specifically 421 and 8. In Roman numerals, it is represented as CDXXIX. In the context of web development, "429" is also known as the "Too Many Requests" HTTP status code. This code indicates that a user has sent too many requests in a given amount of time, often due to rate limiting. It serves as a way to protect servers from being overwhelmed by excessive traffic.