8421804 has 18 divisors (see below), whose sum is σ = 21288540. Its totient is φ = 2807256.

The previous prime is 8421799. The next prime is 8421821. The reversal of 8421804 is 4081248.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×8421804² = 141853565228832, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 116934 + ... + 117005.

Almost surely, 2^8421804 is an apocalyptic number.

It is an amenable number.

8421804 is an abundant number, since it is smaller than the sum of its proper divisors (12866736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8421804 is a wasteful number, since it uses less digits than its factorization.

8421804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233949 (or 233944 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 8421804 is about 2902.0344587892. The cubic root of 8421804 is about 203.4550043692.

The spelling of 8421804 in words is "eight million, four hundred twenty-one thousand, eight hundred four".