865791156 has 12 divisors (see below), whose sum is σ = 2020179392. Its totient is φ = 288597048.

The previous prime is 865791149. The next prime is 865791161. The reversal of 865791156 is 651197568.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36074620 + ... + 36074643.

Almost surely, 2^865791156 is an apocalyptic number.

It is an amenable number.

865791156 is an abundant number, since it is smaller than the sum of its proper divisors (1154388236).

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

865791156 is a wasteful number, since it uses less digits than its factorization.

865791156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72149270 (or 72149268 counting only the distinct ones).

The product of its digits is 453600, while the sum is 48.

The square root of 865791156 is about 29424.3293211587. The cubic root of 865791156 is about 953.0983442313.

The spelling of 865791156 in words is "eight hundred sixty-five million, seven hundred ninety-one thousand, one hundred fifty-six".