8218404 has 36 divisors (see below), whose sum is σ = 20913984. Its totient is φ = 2721072.

The previous prime is 8218391. The next prime is 8218423. The reversal of 8218404 is 4048128.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5329 + ... + 6695.

It is an arithmetic number, because the mean of its divisors is an integer number (580944).

Almost surely, 2^8218404 is an apocalyptic number.

It is an amenable number.

8218404 is an abundant number, since it is smaller than the sum of its proper divisors (12695580).

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

8218404 is a wasteful number, since it uses less digits than its factorization.

8218404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544 (or 1539 counting only the distinct ones).

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

The square root of 8218404 is about 2866.7758893921. The cubic root of 8218404 is about 201.8037174484.

The spelling of 8218404 in words is "eight million, two hundred eighteen thousand, four hundred four".