857943645 has 16 divisors (see below), whose sum is σ = 1478303232. Its totient is φ = 422372160.

The previous prime is 857943617. The next prime is 857943673. The reversal of 857943645 is 546349758.

It is an interprime number because it is at equal distance from previous prime (857943617) and next prime (857943673).

It is not a de Polignac number, because 857943645 - 2¹³ = 857935453 is a prime.

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, 2199661 + ... + 2200050.

It is an arithmetic number, because the mean of its divisors is an integer number (92393952).

Almost surely, 2^857943645 is an apocalyptic number.

It is an amenable number.

857943645 is a deficient number, since it is larger than the sum of its proper divisors (620359587).

857943645 is a wasteful number, since it uses less digits than its factorization.

857943645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4399732.

The product of its digits is 3628800, while the sum is 51.

The square root of 857943645 is about 29290.6750519683. The cubic root of 857943645 is about 950.2099794387.

The spelling of 857943645 in words is "eight hundred fifty-seven million, nine hundred forty-three thousand, six hundred forty-five".