8236821 has 4 divisors (see below), whose sum is σ = 10982432. Its totient is φ = 5491212.

The previous prime is 8236817. The next prime is 8236831. The reversal of 8236821 is 1286328.

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 not a de Polignac number, because 8236821 - 2² = 8236817 is a prime.

It is a Duffinian number.

8236821 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8236801) 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, 1372801 + ... + 1372806.

It is an arithmetic number, because the mean of its divisors is an integer number (2745608).

Almost surely, 2^8236821 is an apocalyptic number.

It is an amenable number.

8236821 is a deficient number, since it is larger than the sum of its proper divisors (2745611).

8236821 is a wasteful number, since it uses less digits than its factorization.

8236821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2745610.

The product of its digits is 4608, while the sum is 30.

The square root of 8236821 is about 2869.9862369008. The cubic root of 8236821 is about 201.9543487335.

The spelling of 8236821 in words is "eight million, two hundred thirty-six thousand, eight hundred twenty-one".