856218478 has 8 divisors (see below), whose sum is σ = 1285480872. Its totient is φ = 427724856.

The previous prime is 856218469. The next prime is 856218529. The reversal of 856218478 is 874812658.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×856218478² = 1466220164137272968, which contains 22 as substring.

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, 189400 + ... + 193867.

It is an arithmetic number, because the mean of its divisors is an integer number (160685109).

Almost surely, 2^856218478 is an apocalyptic number.

856218478 is a deficient number, since it is larger than the sum of its proper divisors (429262394).

856218478 is a wasteful number, since it uses less digits than its factorization.

856218478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384386.

The product of its digits is 860160, while the sum is 49.

The square root of 856218478 is about 29261.2111506000. The cubic root of 856218478 is about 949.5726528514.

The spelling of 856218478 in words is "eight hundred fifty-six million, two hundred eighteen thousand, four hundred seventy-eight".