839921005 has 24 divisors (see below), whose sum is σ = 1279052640. Its totient is φ = 523585440.

The previous prime is 839920999. The next prime is 839921063. The reversal of 839921005 is 500129938.

It is not a de Polignac number, because 839921005 - 2⁹ = 839920493 is a prime.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 153135 + ... + 158524.

It is an arithmetic number, because the mean of its divisors is an integer number (53293860).

Almost surely, 2^839921005 is an apocalyptic number.

It is an amenable number.

839921005 is a deficient number, since it is larger than the sum of its proper divisors (439131635).

839921005 is a wasteful number, since it uses less digits than its factorization.

839921005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311689 (or 311682 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 839921005 is about 28981.3906671160. The cubic root of 839921005 is about 943.5092178158.

The spelling of 839921005 in words is "eight hundred thirty-nine million, nine hundred twenty-one thousand, five".