18805018 has 16 divisors (see below), whose sum is σ = 28987200. Its totient is φ = 9144576.

The previous prime is 18805013. The next prime is 18805027. The reversal of 18805018 is 81050881.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18805013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38371 + ... + 38857.

It is an arithmetic number, because the mean of its divisors is an integer number (1811700).

Almost surely, 2^18805018 is an apocalyptic number.

18805018 is a deficient number, since it is larger than the sum of its proper divisors (10182182).

18805018 is a wasteful number, since it uses less digits than its factorization.

18805018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981.

The product of its (nonzero) digits is 2560, while the sum is 31.

The square root of 18805018 is about 4336.4752968281. The cubic root of 18805018 is about 265.9242345506.

Adding to 18805018 its reverse (81050881), we get a palindrome (99855899).

The spelling of 18805018 in words is "eighteen million, eight hundred five thousand, eighteen".