6429 has 4 divisors (see below), whose sum is σ = 8576. Its totient is φ = 4284.

The previous prime is 6427. The next prime is 6449. The reversal of 6429 is 9246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 6429 - 2¹ = 6427 is a prime.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1069 + ... + 1074.

It is an arithmetic number, because the mean of its divisors is an integer number (2144).

2⁶⁴²⁹ is an apocalyptic number.

It is an amenable number.

6429 is a deficient number, since it is larger than the sum of its proper divisors (2147).

6429 is a wasteful number, since it uses less digits than its factorization.

6429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2146.

The product of its digits is 432, while the sum is 21.

The square root of 6429 is about 80.1810451416. The cubic root of 6429 is about 18.5943560168.

It can be divided in two parts, 642 and 9, that multiplied together give a triangular number (5778 = T₁₀₇).

The spelling of 6429 in words is "six thousand, four hundred twenty-nine".