865121432 has 32 divisors (see below), whose sum is σ = 1962882720. Its totient is φ = 348956160.

The previous prime is 865121423. The next prime is 865121437. The reversal of 865121432 is 234121568.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865121437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 453419 + ... + 455322.

It is an arithmetic number, because the mean of its divisors is an integer number (61340085).

Almost surely, 2^865121432 is an apocalyptic number.

It is an amenable number.

865121432 is an abundant number, since it is smaller than the sum of its proper divisors (1097761288).

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

865121432 is a wasteful number, since it uses less digits than its factorization.

865121432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908771 (or 908767 counting only the distinct ones).

The product of its digits is 11520, while the sum is 32.

The square root of 865121432 is about 29412.9466731914. The cubic root of 865121432 is about 952.8525276397.

The spelling of 865121432 in words is "eight hundred sixty-five million, one hundred twenty-one thousand, four hundred thirty-two".