8538821 has 4 divisors (see below), whose sum is σ = 8571552. Its totient is φ = 8506092.

The previous prime is 8538797. The next prime is 8538833. The reversal of 8538821 is 1288358.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8538821 - 2²² = 4344517 is a prime.

It is a super-2 number, since 2×8538821² = 145822928140082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8538851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15971 + ... + 16496.

It is an arithmetic number, because the mean of its divisors is an integer number (2142888).

Almost surely, 2^8538821 is an apocalyptic number.

It is an amenable number.

8538821 is a deficient number, since it is larger than the sum of its proper divisors (32731).

8538821 is a wasteful number, since it uses less digits than its factorization.

8538821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32730.

The product of its digits is 15360, while the sum is 35.

The square root of 8538821 is about 2922.1261095305. The cubic root of 8538821 is about 204.3929772800.

The spelling of 8538821 in words is "eight million, five hundred thirty-eight thousand, eight hundred twenty-one".