856853240 has 64 divisors (see below), whose sum is σ = 1978214400. Its totient is φ = 333870208.

The previous prime is 856853233. The next prime is 856853267. The reversal of 856853240 is 42358658.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 448367 + ... + 450273.

It is an arithmetic number, because the mean of its divisors is an integer number (30909600).

Almost surely, 2^856853240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 856853240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (989107200).

856853240 is an abundant number, since it is smaller than the sum of its proper divisors (1121361160).

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

856853240 is a wasteful number, since it uses less digits than its factorization.

856853240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2204 (or 2200 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 41.

The square root of 856853240 is about 29272.0556162358. The cubic root of 856853240 is about 949.8072517541.

The spelling of 856853240 in words is "eight hundred fifty-six million, eight hundred fifty-three thousand, two hundred forty".