429

429 is the natural number that comes after 428 and before 430. In common numeral systems, it is written as decimal 429, roman CDXXIX, binary 110101101, octal 655, and hexadecimal 0x1AD. It is an odd, composite number with prime factorization 3 × 11 × 13; its divisors are 1, 3, 11, 13, 33, 39, 143, and 429.

In mathematics, 429 has three distinct prime factors and is not a prime or a power of a prime. Its factorization makes it a relatively small example of a composite number with multiple prime factors, and it can be expressed in several ways using these primes.

In computing, 429 refers to the HTTP status code 429 Too Many Requests. This response indicates that the user or client has sent too many requests in a given amount of time and should slow down or pause before retrying.

In science, the approximate wavelength of 429 nanometers lies in the blue region of the visible spectrum. Wavelengths in this range are associated with blue to violet-blue light.

Historically, 429 can denote the year AD 429 or 429 BCE in historical writing. Years are used in various calendars, and 429 appears in records dealing with late antiquity and ancient history, depending on the chronology used by the source.