864290221 has 8 divisors (see below), whose sum is σ = 910656320. Its totient is φ = 818011872.

The previous prime is 864290213. The next prime is 864290227. The reversal of 864290221 is 122092468.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 864290221 - 2³ = 864290213 is a prime.

It is a super-2 number, since 2×864290221² = 1493995172232457682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864290227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1200 + ... + 41593.

It is an arithmetic number, because the mean of its divisors is an integer number (113832040).

Almost surely, 2^864290221 is an apocalyptic number.

It is an amenable number.

864290221 is a deficient number, since it is larger than the sum of its proper divisors (46366099).

864290221 is a wasteful number, since it uses less digits than its factorization.

864290221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43875.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 864290221 is about 29398.8132583613. The cubic root of 864290221 is about 952.5472620946.

The spelling of 864290221 in words is "eight hundred sixty-four million, two hundred ninety thousand, two hundred twenty-one".