856922005 has 4 divisors (see below), whose sum is σ = 1028306412. Its totient is φ = 685537600.

The previous prime is 856921999. The next prime is 856922029. The reversal of 856922005 is 500229658.

It is a happy number.

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 453434436 + 403487569 = 21294^2 + 20087^2 .

It is not a de Polignac number, because 856922005 - 2³ = 856921997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85692196 + ... + 85692205.

It is an arithmetic number, because the mean of its divisors is an integer number (257076603).

Almost surely, 2^856922005 is an apocalyptic number.

It is an amenable number.

856922005 is a deficient number, since it is larger than the sum of its proper divisors (171384407).

856922005 is a wasteful number, since it uses less digits than its factorization.

856922005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171384406.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 856922005 is about 29273.2301770748. The cubic root of 856922005 is about 949.8326593523.

The spelling of 856922005 in words is "eight hundred fifty-six million, nine hundred twenty-two thousand, five".