18684404 has 6 divisors (see below), whose sum is σ = 32697714. Its totient is φ = 9342200.

The previous prime is 18684389. The next prime is 18684409. The reversal of 18684404 is 40448681.

It can be written as a sum of positive squares in only one way, i.e., 18472804 + 211600 = 4298^2 + 460^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18684409) by changing a digit.

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 as a sum of consecutive naturals, namely, 2335547 + ... + 2335554.

It is an arithmetic number, because the mean of its divisors is an integer number (5449619).

Almost surely, 2^18684404 is an apocalyptic number.

It is an amenable number.

18684404 is a deficient number, since it is larger than the sum of its proper divisors (14013310).

18684404 is a wasteful number, since it uses less digits than its factorization.

18684404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4671105 (or 4671103 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 35.

The square root of 18684404 is about 4322.5460090090. The cubic root of 18684404 is about 265.3544751945.

The spelling of 18684404 in words is "eighteen million, six hundred eighty-four thousand, four hundred four".