865852188 has 48 divisors (see below), whose sum is σ = 2093659680. Its totient is φ = 278175744.

The previous prime is 865852157. The next prime is 865852201. The reversal of 865852188 is 881258568.

It is a super-2 number, since 2×865852188² = 1499400022928774688, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 865852188.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232356 + ... + 236052.

It is an arithmetic number, because the mean of its divisors is an integer number (43617910).

Almost surely, 2^865852188 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 865852188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1046829840).

865852188 is an abundant number, since it is smaller than the sum of its proper divisors (1227807492).

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

865852188 is a wasteful number, since it uses less digits than its factorization.

865852188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4406 (or 4404 counting only the distinct ones).

The product of its digits is 1228800, while the sum is 51.

The square root of 865852188 is about 29425.3664038360. The cubic root of 865852188 is about 953.1207392131.

The spelling of 865852188 in words is "eight hundred sixty-five million, eight hundred fifty-two thousand, one hundred eighty-eight".