865848618 has 24 divisors (see below), whose sum is σ = 1926709668. Its totient is φ = 280815552.

The previous prime is 865848553. The next prime is 865848691. The reversal of 865848618 is 816848568.

It can be written as a sum of positive squares in 2 ways, for example, as 661158369 + 204690249 = 25713^2 + 14307^2 .

It is a Curzon 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 11 ways as a sum of consecutive naturals, for example, 649371 + ... + 650702.

Almost surely, 2^865848618 is an apocalyptic number.

865848618 is an abundant number, since it is smaller than the sum of its proper divisors (1060861050).

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

865848618 is a wasteful number, since it uses less digits than its factorization.

865848618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1300118 (or 1300115 counting only the distinct ones).

The product of its digits is 2949120, while the sum is 54.

The square root of 865848618 is about 29425.3057418271. The cubic root of 865848618 is about 953.1194292721.

Subtracting from 865848618 its reverse (816848568), we obtain a triangular number (49000050 = T₉₈₉₉).

The spelling of 865848618 in words is "eight hundred sixty-five million, eight hundred forty-eight thousand, six hundred eighteen".