856889919 has 24 divisors (see below), whose sum is σ = 1283115600. Its totient is φ = 550603008.

The previous prime is 856889899. The next prime is 856889963. The reversal of 856889919 is 919988658.

It is not a de Polignac number, because 856889919 - 2¹⁵ = 856857151 is a prime.

It is a super-2 number, since 2×856889919² = 1468520666567653122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856889989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23607 + ... + 47655.

It is an arithmetic number, because the mean of its divisors is an integer number (53463150).

Almost surely, 2^856889919 is an apocalyptic number.

856889919 is a deficient number, since it is larger than the sum of its proper divisors (426225681).

856889919 is a wasteful number, since it uses less digits than its factorization.

856889919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24199 (or 24196 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 63.

The square root of 856889919 is about 29272.6821285649. The cubic root of 856889919 is about 949.8208042434.

The spelling of 856889919 in words is "eight hundred fifty-six million, eight hundred eighty-nine thousand, nine hundred nineteen".