857945 has 16 divisors (see below), whose sum is σ = 1183680. Its totient is φ = 590400.

The previous prime is 857929. The next prime is 857951. The reversal of 857945 is 549758.

It is not a de Polignac number, because 857945 - 2⁴ = 857929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 857899 and 857908.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 635 + ... + 1455.

It is an arithmetic number, because the mean of its divisors is an integer number (73980).

2⁸⁵⁷⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

857945 is a deficient number, since it is larger than the sum of its proper divisors (325735).

857945 is a wasteful number, since it uses less digits than its factorization.

857945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856.

The product of its digits is 50400, while the sum is 38.

The square root of 857945 is about 926.2532051227. The cubic root of 857945 is about 95.0210479679.

The spelling of 857945 in words is "eight hundred fifty-seven thousand, nine hundred forty-five".