8423821 has 8 divisors (see below), whose sum is σ = 10134080. Its totient is φ = 6840288.

The previous prime is 8423803. The next prime is 8423867. The reversal of 8423821 is 1283248.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8423821 - 2¹¹ = 8421773 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 8423821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8423801) 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, 31536 + ... + 31801.

It is an arithmetic number, because the mean of its divisors is an integer number (1266760).

Almost surely, 2^8423821 is an apocalyptic number.

It is an amenable number.

8423821 is a deficient number, since it is larger than the sum of its proper divisors (1710259).

8423821 is a wasteful number, since it uses less digits than its factorization.

8423821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63363.

The product of its digits is 3072, while the sum is 28.

The square root of 8423821 is about 2902.3819528105. The cubic root of 8423821 is about 203.4712453863.

The spelling of 8423821 in words is "eight million, four hundred twenty-three thousand, eight hundred twenty-one".