860398891 has 4 divisors (see below), whose sum is σ = 938616984. Its totient is φ = 782180800.

The previous prime is 860398871. The next prime is 860398939. The reversal of 860398891 is 198893068.

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 860398891 - 2⁵ = 860398859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (860398801) 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, 39109030 + ... + 39109051.

It is an arithmetic number, because the mean of its divisors is an integer number (234654246).

Almost surely, 2^860398891 is an apocalyptic number.

860398891 is a deficient number, since it is larger than the sum of its proper divisors (78218093).

860398891 is a wasteful number, since it uses less digits than its factorization.

860398891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78218092.

The product of its (nonzero) digits is 746496, while the sum is 52.

The square root of 860398891 is about 29332.5568438894. The cubic root of 860398891 is about 951.1155467939.

The spelling of 860398891 in words is "eight hundred sixty million, three hundred ninety-eight thousand, eight hundred ninety-one".