856291889 has 8 divisors (see below), whose sum is σ = 885941760. Its totient is φ = 826768800.

The previous prime is 856291871. The next prime is 856291907. The reversal of 856291889 is 988192658.

856291889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (856291871) and next prime (856291907).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 856291889 - 2¹² = 856287793 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (856291589) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17852 + ... + 45069.

It is an arithmetic number, because the mean of its divisors is an integer number (110742720).

Almost surely, 2^856291889 is an apocalyptic number.

It is an amenable number.

856291889 is a deficient number, since it is larger than the sum of its proper divisors (29649871).

856291889 is a wasteful number, since it uses less digits than its factorization.

856291889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63391.

The product of its digits is 2488320, while the sum is 56.

The square root of 856291889 is about 29262.4655318037. The cubic root of 856291889 is about 949.5997904289.

The spelling of 856291889 in words is "eight hundred fifty-six million, two hundred ninety-one thousand, eight hundred eighty-nine".