868889859 has 4 divisors (see below), whose sum is σ = 1158519816. Its totient is φ = 579259904.

The previous prime is 868889849. The next prime is 868889867. The reversal of 868889859 is 958988868.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 868889859 - 2⁸ = 868889603 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 868889793 and 868889802.

It is not an unprimeable number, because it can be changed into a prime (868889809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144814974 + ... + 144814979.

It is an arithmetic number, because the mean of its divisors is an integer number (289629954).

Almost surely, 2^868889859 is an apocalyptic number.

868889859 is a deficient number, since it is larger than the sum of its proper divisors (289629957).

868889859 is a wasteful number, since it uses less digits than its factorization.

868889859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289629956.

The product of its digits is 79626240, while the sum is 69.

The square root of 868889859 is about 29476.9377480090. The cubic root of 868889859 is about 954.2340500949.

Subtracting 868889859 from its reverse (958988868), we obtain a palindrome (90099009).

The spelling of 868889859 in words is "eight hundred sixty-eight million, eight hundred eighty-nine thousand, eight hundred fifty-nine".