8398821 has 4 divisors (see below), whose sum is σ = 11198432. Its totient is φ = 5599212.

The previous prime is 8398811. The next prime is 8398877. The reversal of 8398821 is 1288938.

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 8398821 - 2⁶ = 8398757 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8398821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8398801) 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, 1399801 + ... + 1399806.

It is an arithmetic number, because the mean of its divisors is an integer number (2799608).

Almost surely, 2^8398821 is an apocalyptic number.

It is an amenable number.

8398821 is a deficient number, since it is larger than the sum of its proper divisors (2799611).

8398821 is a wasteful number, since it uses less digits than its factorization.

8398821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2799610.

The product of its digits is 27648, while the sum is 39.

The square root of 8398821 is about 2898.0719452767. The cubic root of 8398821 is about 203.2697603521.

The spelling of 8398821 in words is "eight million, three hundred ninety-eight thousand, eight hundred twenty-one".