428439289 has 4 divisors (see below), whose sum is σ = 428544100. Its totient is φ = 428334480.

The previous prime is 428439281. The next prime is 428439311. The reversal of 428439289 is 982934824.

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

It can be written as a sum of positive squares in 2 ways, for example, as 304851600 + 123587689 = 17460^2 + 11117^2 .

It is a cyclic number.

It is not a de Polignac number, because 428439289 - 2³ = 428439281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428439281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46014 + ... + 54535.

It is an arithmetic number, because the mean of its divisors is an integer number (107136025).

Almost surely, 2^428439289 is an apocalyptic number.

It is an amenable number.

428439289 is a deficient number, since it is larger than the sum of its proper divisors (104811).

428439289 is a wasteful number, since it uses less digits than its factorization.

428439289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104810.

The product of its digits is 995328, while the sum is 49.

The square root of 428439289 is about 20698.7750603749. The cubic root of 428439289 is about 753.8699460482.

The spelling of 428439289 in words is "four hundred twenty-eight million, four hundred thirty-nine thousand, two hundred eighty-nine".