865047321 has 12 divisors (see below), whose sum is σ = 1270691760. Its totient is φ = 566923320.

The previous prime is 865047317. The next prime is 865047341. The reversal of 865047321 is 123740568.

865047321 is a `hidden beast` number, since 86 + 504 + 73 + 2 + 1 = 666.

It is not a de Polignac number, because 865047321 - 2² = 865047317 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (865047301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 814015 + ... + 815076.

It is an arithmetic number, because the mean of its divisors is an integer number (105890980).

Almost surely, 2^865047321 is an apocalyptic number.

It is an amenable number.

865047321 is a deficient number, since it is larger than the sum of its proper divisors (405644439).

865047321 is a wasteful number, since it uses less digits than its factorization.

865047321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1629156 (or 1629153 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 865047321 is about 29411.6868098380. The cubic root of 865047321 is about 952.8253180220.

Adding to 865047321 its reverse (123740568), we get a palindrome (988787889).

The spelling of 865047321 in words is "eight hundred sixty-five million, forty-seven thousand, three hundred twenty-one".