857085844 has 12 divisors (see below), whose sum is σ = 1502885664. Its totient is φ = 427689944.

The previous prime is 857085841. The next prime is 857085881. The reversal of 857085844 is 448580758.

It is a super-2 number, since 2×857085844² = 1469192287970384672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857085841) 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, 210982 + ... + 215005.

It is an arithmetic number, because the mean of its divisors is an integer number (125240472).

Almost surely, 2^857085844 is an apocalyptic number.

It is an amenable number.

857085844 is a deficient number, since it is larger than the sum of its proper divisors (645799820).

857085844 is a wasteful number, since it uses less digits than its factorization.

857085844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426494 (or 426492 counting only the distinct ones).

The product of its (nonzero) digits is 1433600, while the sum is 49.

The square root of 857085844 is about 29276.0284874844. The cubic root of 857085844 is about 949.8931898383.

The spelling of 857085844 in words is "eight hundred fifty-seven million, eighty-five thousand, eight hundred forty-four".