865115838 has 12 divisors (see below), whose sum is σ = 1874417688. Its totient is φ = 288371940.

The previous prime is 865115837. The next prime is 865115851. The reversal of 865115838 is 838511568.

865115838 is a `hidden beast` number, since 8 + 65 + 1 + 1 + 583 + 8 = 666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 865115793 and 865115802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865115831) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 24030978 + ... + 24031013.

It is an arithmetic number, because the mean of its divisors is an integer number (156201474).

Almost surely, 2^865115838 is an apocalyptic number.

865115838 is an abundant number, since it is smaller than the sum of its proper divisors (1009301850).

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

865115838 is a wasteful number, since it uses less digits than its factorization.

865115838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48061999 (or 48061996 counting only the distinct ones).

The product of its digits is 230400, while the sum is 45.

The square root of 865115838 is about 29412.8515788592. The cubic root of 865115838 is about 952.8504738746.

The spelling of 865115838 in words is "eight hundred sixty-five million, one hundred fifteen thousand, eight hundred thirty-eight".