18394004 has 24 divisors (see below), whose sum is σ = 33483240. Its totient is φ = 8830976.

The previous prime is 18393989. The next prime is 18394073. The reversal of 18394004 is 40049381.

It can be written as a sum of positive squares in 4 ways, for example, as 3168400 + 15225604 = 1780^2 + 3902^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable 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 in 7 ways as a sum of consecutive naturals, for example, 29504 + ... + 30120.

It is an arithmetic number, because the mean of its divisors is an integer number (1395135).

Almost surely, 2^18394004 is an apocalyptic number.

It is an amenable number.

18394004 is a deficient number, since it is larger than the sum of its proper divisors (15089236).

18394004 is a wasteful number, since it uses less digits than its factorization.

18394004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907 (or 905 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 18394004 is about 4288.8231486038. The cubic root of 18394004 is about 263.9725445889.

The spelling of 18394004 in words is "eighteen million, three hundred ninety-four thousand, four".