8549821 has 8 divisors (see below), whose sum is σ = 9931904. Its totient is φ = 7207920.

The previous prime is 8549797. The next prime is 8549837. The reversal of 8549821 is 1289458.

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 8549821 - 2⁵ = 8549789 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8549881) 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, 9585 + ... + 10438.

It is an arithmetic number, because the mean of its divisors is an integer number (1241488).

Almost surely, 2^8549821 is an apocalyptic number.

It is an amenable number.

8549821 is a deficient number, since it is larger than the sum of its proper divisors (1382083).

8549821 is a wasteful number, since it uses less digits than its factorization.

8549821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20091.

The product of its digits is 23040, while the sum is 37.

The square root of 8549821 is about 2924.0076949283. The cubic root of 8549821 is about 204.4807082827.

The spelling of 8549821 in words is "eight million, five hundred forty-nine thousand, eight hundred twenty-one".