18111204 has 36 divisors (see below), whose sum is σ = 47021884. Its totient is φ = 5873472.

The previous prime is 18111187. The next prime is 18111229. The reversal of 18111204 is 40211181.

It can be written as a sum of positive squares in 2 ways, for example, as 8820900 + 9290304 = 2970^2 + 3048^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

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 11 ways as a sum of consecutive naturals, for example, 5467 + ... + 8130.

Almost surely, 2^18111204 is an apocalyptic number.

It is an amenable number.

18111204 is an abundant number, since it is smaller than the sum of its proper divisors (28910680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18111204 is a wasteful number, since it uses less digits than its factorization.

18111204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13644 (or 13639 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 18111204 is about 4255.7260250162. The cubic root of 18111204 is about 262.6127298129.

Adding to 18111204 its reverse (40211181), we get a palindrome (58322385).

The spelling of 18111204 in words is "eighteen million, one hundred eleven thousand, two hundred four".