18389404 has 12 divisors (see below), whose sum is σ = 35107128. Its totient is φ = 8358800.

The previous prime is 18389401. The next prime is 18389453. The reversal of 18389404 is 40498381.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18389401) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 208927 + ... + 209014.

It is an arithmetic number, because the mean of its divisors is an integer number (2925594).

Almost surely, 2^18389404 is an apocalyptic number.

It is an amenable number.

18389404 is a deficient number, since it is larger than the sum of its proper divisors (16717724).

18389404 is a wasteful number, since it uses less digits than its factorization.

18389404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417956 (or 417954 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 18389404 is about 4288.2868374212. The cubic root of 18389404 is about 263.9505378716.

The spelling of 18389404 in words is "eighteen million, three hundred eighty-nine thousand, four hundred four".