865853793 has 20 divisors (see below), whose sum is σ = 1478213440. Its totient is φ = 494773272.

The previous prime is 865853789. The next prime is 865853831. The reversal of 865853793 is 397358568.

It is a happy number.

It is not a de Polignac number, because 865853793 - 2² = 865853789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (865853743) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 762973 + ... + 764106.

It is an arithmetic number, because the mean of its divisors is an integer number (73910672).

Almost surely, 2^865853793 is an apocalyptic number.

It is an amenable number.

865853793 is a deficient number, since it is larger than the sum of its proper divisors (612359647).

865853793 is a wasteful number, since it uses less digits than its factorization.

865853793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1527098 (or 1527089 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 54.

The square root of 865853793 is about 29425.3936762110. The cubic root of 865853793 is about 953.1213281349.

The spelling of 865853793 in words is "eight hundred sixty-five million, eight hundred fifty-three thousand, seven hundred ninety-three".