856423872 has 42 divisors (see below), whose sum is σ = 2454786048. Its totient is φ = 285474432.

The previous prime is 856423783. The next prime is 856423901. The reversal of 856423872 is 278324658.

856423872 is a `hidden beast` number, since 8 + 564 + 2 + 3 + 87 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 742848 + ... + 743999.

Almost surely, 2^856423872 is an apocalyptic number.

It is an amenable number.

856423872 is an abundant number, since it is smaller than the sum of its proper divisors (1598362176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

856423872 is a wasteful number, since it uses less digits than its factorization.

856423872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1486865 (or 1486852 counting only the distinct ones).

The product of its digits is 645120, while the sum is 45.

The square root of 856423872 is about 29264.7206034843. The cubic root of 856423872 is about 949.6485762039.

The spelling of 856423872 in words is "eight hundred fifty-six million, four hundred twenty-three thousand, eight hundred seventy-two".