18905144 has 16 divisors (see below), whose sum is σ = 35494200. Its totient is φ = 9440032.

The previous prime is 18905143. The next prime is 18905147. The reversal of 18905144 is 44150981.

It is a self number, because there is not a number n which added to its sum of digits gives 18905144.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18905143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9134 + ... + 11010.

Almost surely, 2^18905144 is an apocalyptic number.

It is an amenable number.

18905144 is a deficient number, since it is larger than the sum of its proper divisors (16589056).

18905144 is a wasteful number, since it uses less digits than its factorization.

18905144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3142 (or 3138 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 18905144 is about 4348.0045998136. The cubic root of 18905144 is about 266.3953643528.

The spelling of 18905144 in words is "eighteen million, nine hundred five thousand, one hundred forty-four".