856671489 has 12 divisors (see below), whose sum is σ = 1260762516. Its totient is φ = 560338272.

The previous prime is 856671467. The next prime is 856671503. The reversal of 856671489 is 984176658.

856671489 is a `hidden beast` number, since 8 + 566 + 71 + 4 + 8 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 289850625 + 566820864 = 17025^2 + 23808^2 .

It is not a de Polignac number, because 856671489 - 2⁵ = 856671457 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (856671889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 897502 + ... + 898455.

It is an arithmetic number, because the mean of its divisors is an integer number (105063543).

Almost surely, 2^856671489 is an apocalyptic number.

It is an amenable number.

856671489 is a deficient number, since it is larger than the sum of its proper divisors (404091027).

856671489 is a wasteful number, since it uses less digits than its factorization.

856671489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1796016 (or 1796013 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 856671489 is about 29268.9509378112. The cubic root of 856671489 is about 949.7400910406.

The spelling of 856671489 in words is "eight hundred fifty-six million, six hundred seventy-one thousand, four hundred eighty-nine".