429 = 3 x 11 x 13.
429 is the seventh Catalan number.
429 is a divisor of 1003 - 1.
The sum of the digits of 429 is five times the number of digits: 4 + 2 + 9 = 15 = 5 x 3.
The sum of the fourth powers of the factors of 429 is a prime: 34 + 114 + 134 = 43283.