428831 has 4 divisors (see below), whose sum is σ = 461832. Its totient is φ = 395832.

The previous prime is 428809. The next prime is 428833. The reversal of 428831 is 138824.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428831 is a prime.

It is a super-2 number, since 2×428831² = 367792053122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 428831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16481 + ... + 16506.

It is an arithmetic number, because the mean of its divisors is an integer number (115458).

2⁴²⁸⁸³¹ is an apocalyptic number.

428831 is a deficient number, since it is larger than the sum of its proper divisors (33001).

428831 is a wasteful number, since it uses less digits than its factorization.

428831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33000.

The product of its digits is 1536, while the sum is 26.

The square root of 428831 is about 654.8518916518. The cubic root of 428831 is about 75.4099624020.

The spelling of 428831 in words is "four hundred twenty-eight thousand, eight hundred thirty-one".