429821 has 4 divisors (see below), whose sum is σ = 491232. Its totient is φ = 368412.

The previous prime is 429817. The next prime is 429823. The reversal of 429821 is 128924.

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 a cyclic number.

It is not a de Polignac number, because 429821 - 2² = 429817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (429823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30695 + ... + 30708.

It is an arithmetic number, because the mean of its divisors is an integer number (122808).

2⁴²⁹⁸²¹ is an apocalyptic number.

It is an amenable number.

429821 is a deficient number, since it is larger than the sum of its proper divisors (61411).

429821 is an equidigital number, since it uses as much as digits as its factorization.

429821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61410.

The product of its digits is 1152, while the sum is 26.

The square root of 429821 is about 655.6073520027. The cubic root of 429821 is about 75.4679483267.

The spelling of 429821 in words is "four hundred twenty-nine thousand, eight hundred twenty-one".