864197863 has 4 divisors (see below), whose sum is σ = 887554600. Its totient is φ = 840841128.

The previous prime is 864197857. The next prime is 864197899. The reversal of 864197863 is 368791468.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-864197863 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 864197863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864197833) 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, 11678313 + ... + 11678386.

It is an arithmetic number, because the mean of its divisors is an integer number (221888650).

Almost surely, 2^864197863 is an apocalyptic number.

864197863 is a deficient number, since it is larger than the sum of its proper divisors (23356737).

864197863 is a wasteful number, since it uses less digits than its factorization.

864197863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23356736.

The product of its digits is 1741824, while the sum is 52.

The square root of 864197863 is about 29397.2424387050. The cubic root of 864197863 is about 952.5133311719.

The spelling of 864197863 in words is "eight hundred sixty-four million, one hundred ninety-seven thousand, eight hundred sixty-three".