8216404 has 24 divisors (see below), whose sum is σ = 16668288. Its totient is φ = 3470880.

The previous prime is 8216387. The next prime is 8216407. The reversal of 8216404 is 4046128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8216407) 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, 79 + ... + 4054.

It is an arithmetic number, because the mean of its divisors is an integer number (694512).

Almost surely, 2^8216404 is an apocalyptic number.

It is an amenable number.

8216404 is an abundant number, since it is smaller than the sum of its proper divisors (8451884).

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

8216404 is a wasteful number, since it uses less digits than its factorization.

8216404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4215 (or 4213 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 8216404 is about 2866.4270442486. The cubic root of 8216404 is about 201.7873460548.

It can be divided in two parts, 821 and 6404, that added together give a square (7225 = 85²).

The spelling of 8216404 in words is "eight million, two hundred sixteen thousand, four hundred four".