839665423 has 6 divisors (see below), whose sum is σ = 886184664. Its totient is φ = 795472164.

The previous prime is 839665399. The next prime is 839665441. The reversal of 839665423 is 324566938.

It is a happy number.

It is not a de Polignac number, because 839665423 - 2²¹ = 837568271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (839665523) 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 5 ways as a sum of consecutive naturals, for example, 1162611 + ... + 1163332.

It is an arithmetic number, because the mean of its divisors is an integer number (147697444).

Almost surely, 2^839665423 is an apocalyptic number.

839665423 is a deficient number, since it is larger than the sum of its proper divisors (46519241).

839665423 is a wasteful number, since it uses less digits than its factorization.

839665423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2325981 (or 2325962 counting only the distinct ones).

The product of its digits is 933120, while the sum is 46.

The square root of 839665423 is about 28976.9809158925. The cubic root of 839665423 is about 943.4135070545.

The spelling of 839665423 in words is "eight hundred thirty-nine million, six hundred sixty-five thousand, four hundred twenty-three".