856618492 has 12 divisors (see below), whose sum is σ = 1501640280. Its totient is φ = 427578416.

The previous prime is 856618481. The next prime is 856618493. The reversal of 856618492 is 294816658.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856618493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180067 + ... + 184762.

It is an arithmetic number, because the mean of its divisors is an integer number (125136690).

Almost surely, 2^856618492 is an apocalyptic number.

It is an amenable number.

856618492 is a deficient number, since it is larger than the sum of its proper divisors (645021788).

856618492 is a wasteful number, since it uses less digits than its factorization.

856618492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365420 (or 365418 counting only the distinct ones).

The product of its digits is 829440, while the sum is 49.

The square root of 856618492 is about 29268.0455787536. The cubic root of 856618492 is about 949.7205057759.

The spelling of 856618492 in words is "eight hundred fifty-six million, six hundred eighteen thousand, four hundred ninety-two".