8220404 has 6 divisors (see below), whose sum is σ = 14385714. Its totient is φ = 4110200.

The previous prime is 8220397. The next prime is 8220409. The reversal of 8220404 is 4040228.

It can be written as a sum of positive squares in only one way, i.e., 8179600 + 40804 = 2860^2 + 202^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8220409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1027547 + ... + 1027554.

It is an arithmetic number, because the mean of its divisors is an integer number (2397619).

Almost surely, 2^8220404 is an apocalyptic number.

It is an amenable number.

8220404 is a deficient number, since it is larger than the sum of its proper divisors (6165310).

8220404 is a wasteful number, since it uses less digits than its factorization.

8220404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2055105 (or 2055103 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 8220404 is about 2867.1246920914. The cubic root of 8220404 is about 201.8200861862.

The spelling of 8220404 in words is "eight million, two hundred twenty thousand, four hundred four".