865212512 has 12 divisors (see below), whose sum is σ = 1703387196. Its totient is φ = 432606240.

The previous prime is 865212487. The next prime is 865212529. The reversal of 865212512 is 215212568.

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 27037891 = 865212512 / (8 + 6 + 5 + 2 + 1 + 2 + 5 + 1 + 2).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13518914 + ... + 13518977.

It is an arithmetic number, because the mean of its divisors is an integer number (141948933).

Almost surely, 2^865212512 is an apocalyptic number.

It is an amenable number.

865212512 is a deficient number, since it is larger than the sum of its proper divisors (838174684).

865212512 is a wasteful number, since it uses less digits than its factorization.

865212512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27037901 (or 27037893 counting only the distinct ones).

The product of its digits is 9600, while the sum is 32.

The square root of 865212512 is about 29414.4949302211. The cubic root of 865212512 is about 952.8859652434.

The spelling of 865212512 in words is "eight hundred sixty-five million, two hundred twelve thousand, five hundred twelve".