865188222 has 8 divisors (see below), whose sum is σ = 1730376456. Its totient is φ = 288396072.

The previous prime is 865188151. The next prime is 865188223. The reversal of 865188222 is 222881568.

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

865188222 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865188223) 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, 72099013 + ... + 72099024.

It is an arithmetic number, because the mean of its divisors is an integer number (216297057).

Almost surely, 2^865188222 is an apocalyptic number.

865188222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

865188222 is a wasteful number, since it uses less digits than its factorization.

865188222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144198042.

The product of its digits is 122880, while the sum is 42.

The square root of 865188222 is about 29414.0820356509. The cubic root of 865188222 is about 952.8770480443.

The spelling of 865188222 in words is "eight hundred sixty-five million, one hundred eighty-eight thousand, two hundred twenty-two".