18638118 has 12 divisors (see below), whose sum is σ = 40382628. Its totient is φ = 6212700.

The previous prime is 18638111. The next prime is 18638131. The reversal of 18638118 is 81183681.

18638118 is a `hidden beast` number, since 1 + 8 + 638 + 1 + 18 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18638111) 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 5 ways as a sum of consecutive naturals, for example, 517708 + ... + 517743.

It is an arithmetic number, because the mean of its divisors is an integer number (3365219).

Almost surely, 2^18638118 is an apocalyptic number.

18638118 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18638118 is an abundant number, since it is smaller than the sum of its proper divisors (21744510).

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

18638118 is a wasteful number, since it uses less digits than its factorization.

18638118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035459 (or 1035456 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 18638118 is about 4317.1886685666. The cubic root of 18638118 is about 265.1351772663.

The spelling of 18638118 in words is "eighteen million, six hundred thirty-eight thousand, one hundred eighteen".