865857223 has 16 divisors (see below), whose sum is σ = 1084287744. Its totient is φ = 671708160.

The previous prime is 865857203. The next prime is 865857247. The reversal of 865857223 is 322758568.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 865857223 - 2⁵ = 865857191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865857203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7290 + ... + 42247.

It is an arithmetic number, because the mean of its divisors is an integer number (67767984).

Almost surely, 2^865857223 is an apocalyptic number.

865857223 is a deficient number, since it is larger than the sum of its proper divisors (218430521).

865857223 is a wasteful number, since it uses less digits than its factorization.

865857223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49782.

The product of its digits is 806400, while the sum is 46.

The square root of 865857223 is about 29425.4519591458. The cubic root of 865857223 is about 953.1225867007.

The spelling of 865857223 in words is "eight hundred sixty-five million, eight hundred fifty-seven thousand, two hundred twenty-three".