818404 has 6 divisors (see below), whose sum is σ = 1432214. Its totient is φ = 409200.

The previous prime is 818399. The next prime is 818413. The reversal of 818404 is 404818.

It can be written as a sum of positive squares in only one way, i.e., 756900 + 61504 = 870^2 + 248^2 .

It is a congruent number.

It is an unprimeable number.

818404 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102297 + ... + 102304.

2⁸¹⁸⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

818404 is a deficient number, since it is larger than the sum of its proper divisors (613810).

818404 is a wasteful number, since it uses less digits than its factorization.

818404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204605 (or 204603 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 818404 is about 904.6568410176. The cubic root of 818404 is about 93.5382515760.

The spelling of 818404 in words is "eight hundred eighteen thousand, four hundred four".