8539221 has 8 divisors (see below), whose sum is σ = 11402784. Its totient is φ = 5684240.

The previous prime is 8539213. The next prime is 8539259. The reversal of 8539221 is 1229358.

It is a happy number.

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 8539221 - 2³ = 8539213 is a prime.

8539221 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8539121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 730 + ... + 4196.

It is an arithmetic number, because the mean of its divisors is an integer number (1425348).

Almost surely, 2^8539221 is an apocalyptic number.

It is an amenable number.

8539221 is a deficient number, since it is larger than the sum of its proper divisors (2863563).

8539221 is a wasteful number, since it uses less digits than its factorization.

8539221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4291.

The product of its digits is 4320, while the sum is 30.

The square root of 8539221 is about 2922.1945520447. The cubic root of 8539221 is about 204.3961688180.

The spelling of 8539221 in words is "eight million, five hundred thirty-nine thousand, two hundred twenty-one".