857456889 has 16 divisors (see below), whose sum is σ = 1149600192. Its totient is φ = 568484928.

The previous prime is 857456867. The next prime is 857456983. The reversal of 857456889 is 988654758.

It is not a de Polignac number, because 857456889 - 2⁵ = 857456857 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (857456689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 845947 + ... + 846959.

It is an arithmetic number, because the mean of its divisors is an integer number (71850012).

Almost surely, 2^857456889 is an apocalyptic number.

It is an amenable number.

857456889 is a deficient number, since it is larger than the sum of its proper divisors (292143303).

857456889 is a wasteful number, since it uses less digits than its factorization.

857456889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2296.

The product of its digits is 19353600, while the sum is 60.

The square root of 857456889 is about 29282.3648122893. The cubic root of 857456889 is about 950.0302442818.

The spelling of 857456889 in words is "eight hundred fifty-seven million, four hundred fifty-six thousand, eight hundred eighty-nine".