856684812 has 12 divisors (see below), whose sum is σ = 1998931256. Its totient is φ = 285561600.

The previous prime is 856684811. The next prime is 856684813. The reversal of 856684812 is 218486658.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (856684811) and next prime (856684813).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×856684812² = 1467817734222950688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (856684811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35695189 + ... + 35695212.

Almost surely, 2^856684812 is an apocalyptic number.

It is an amenable number.

856684812 is an abundant number, since it is smaller than the sum of its proper divisors (1142246444).

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

856684812 is a wasteful number, since it uses less digits than its factorization.

856684812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71390408 (or 71390406 counting only the distinct ones).

The product of its digits is 737280, while the sum is 48.

The square root of 856684812 is about 29269.1785330576. The cubic root of 856684812 is about 949.7450144844.

The spelling of 856684812 in words is "eight hundred fifty-six million, six hundred eighty-four thousand, eight hundred twelve".