863839221 has 16 divisors (see below), whose sum is σ = 1373558784. Its totient is φ = 472160304.

The previous prime is 863839189. The next prime is 863839231. The reversal of 863839221 is 122938368.

It is not a de Polignac number, because 863839221 - 2⁵ = 863839189 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863839231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 893761 + ... + 894726.

It is an arithmetic number, because the mean of its divisors is an integer number (85847424).

Almost surely, 2^863839221 is an apocalyptic number.

It is an amenable number.

863839221 is a deficient number, since it is larger than the sum of its proper divisors (509719563).

863839221 is a wasteful number, since it uses less digits than its factorization.

863839221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1788520.

The product of its digits is 124416, while the sum is 42.

The square root of 863839221 is about 29391.1418798249. The cubic root of 863839221 is about 952.3815486378.

The spelling of 863839221 in words is "eight hundred sixty-three million, eight hundred thirty-nine thousand, two hundred twenty-one".