18055518 has 16 divisors (see below), whose sum is σ = 38888976. Its totient is φ = 5555520.

The previous prime is 18055517. The next prime is 18055553. The reversal of 18055518 is 81555081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18055511) 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 7 ways as a sum of consecutive naturals, for example, 115663 + ... + 115818.

It is an arithmetic number, because the mean of its divisors is an integer number (2430561).

Almost surely, 2^18055518 is an apocalyptic number.

18055518 is an abundant number, since it is smaller than the sum of its proper divisors (20833458).

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

18055518 is a wasteful number, since it uses less digits than its factorization.

18055518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231499.

The product of its (nonzero) digits is 8000, while the sum is 33.

The square root of 18055518 is about 4249.1785088414. The cubic root of 18055518 is about 262.3433042136.

The spelling of 18055518 in words is "eighteen million, fifty-five thousand, five hundred eighteen".