865565994 has 16 divisors (see below), whose sum is σ = 1744348320. Its totient is φ = 286319280.

The previous prime is 865565983. The next prime is 865566001. The reversal of 865565994 is 499565568.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 549829 + ... + 551400.

It is an arithmetic number, because the mean of its divisors is an integer number (109021770).

Almost surely, 2^865565994 is an apocalyptic number.

865565994 is an abundant number, since it is smaller than the sum of its proper divisors (878782326).

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

865565994 is a wasteful number, since it uses less digits than its factorization.

865565994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101365.

The product of its digits is 11664000, while the sum is 57.

The square root of 865565994 is about 29420.5029528728. The cubic root of 865565994 is about 953.0157145525.

The spelling of 865565994 in words is "eight hundred sixty-five million, five hundred sixty-five thousand, nine hundred ninety-four".