428434873 has 4 divisors (see below), whose sum is σ = 428571108. Its totient is φ = 428298640.

The previous prime is 428434847. The next prime is 428434891. The reversal of 428434873 is 378434824.

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 277955584 + 150479289 = 16672^2 + 12267^2 .

It is a cyclic number.

It is not a de Polignac number, because 428434873 - 2⁹ = 428434361 is a prime.

It is a super-2 number, since 2×428434873² = 367112880805052258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428434273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63286 + ... + 69727.

It is an arithmetic number, because the mean of its divisors is an integer number (107142777).

Almost surely, 2^428434873 is an apocalyptic number.

It is an amenable number.

428434873 is a deficient number, since it is larger than the sum of its proper divisors (136235).

428434873 is a wasteful number, since it uses less digits than its factorization.

428434873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136234.

The product of its digits is 516096, while the sum is 43.

The square root of 428434873 is about 20698.6683871209. The cubic root of 428434873 is about 753.8673559488.

The spelling of 428434873 in words is "four hundred twenty-eight million, four hundred thirty-four thousand, eight hundred seventy-three".