865540863 has 32 divisors (see below), whose sum is σ = 1443993600. Its totient is φ = 507643200.

The previous prime is 865540859. The next prime is 865540867. The reversal of 865540863 is 368045568.

It is an interprime number because it is at equal distance from previous prime (865540859) and next prime (865540867).

It is not a de Polignac number, because 865540863 - 2² = 865540859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865540867) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37798 + ... + 56211.

It is an arithmetic number, because the mean of its divisors is an integer number (45124800).

Almost surely, 2^865540863 is an apocalyptic number.

865540863 is a deficient number, since it is larger than the sum of its proper divisors (578452737).

865540863 is a wasteful number, since it uses less digits than its factorization.

865540863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94060 (or 94054 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The square root of 865540863 is about 29420.0758496643. The cubic root of 865540863 is about 953.0064911195.

The spelling of 865540863 in words is "eight hundred sixty-five million, five hundred forty thousand, eight hundred sixty-three".