18194872 has 16 divisors (see below), whose sum is σ = 34468560. Its totient is φ = 9003264.

The previous prime is 18194867. The next prime is 18194873. The reversal of 18194872 is 27849181.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18194873) 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, 10948 + ... + 12499.

It is an arithmetic number, because the mean of its divisors is an integer number (2154285).

Almost surely, 2^18194872 is an apocalyptic number.

It is an amenable number.

18194872 is a deficient number, since it is larger than the sum of its proper divisors (16273688).

18194872 is a wasteful number, since it uses less digits than its factorization.

18194872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23550 (or 23546 counting only the distinct ones).

The product of its digits is 32256, while the sum is 40.

The square root of 18194872 is about 4265.5447483293. The cubic root of 18194872 is about 263.0165044315.

The spelling of 18194872 in words is "eighteen million, one hundred ninety-four thousand, eight hundred seventy-two".