18545418 has 24 divisors (see below), whose sum is σ = 40583556. Its totient is φ = 6120600.

The previous prime is 18545381. The next prime is 18545467. The reversal of 18545418 is 81454581.

It can be written as a sum of positive squares in 2 ways, for example, as 14493249 + 4052169 = 3807^2 + 2013^2 .

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 183568 + ... + 183668.

Almost surely, 2^18545418 is an apocalyptic number.

18545418 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18545418 is an abundant number, since it is smaller than the sum of its proper divisors (22038138).

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

18545418 is an frugal number, since it uses more digits than its factorization.

18545418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311 (or 106 counting only the distinct ones).

The product of its digits is 25600, while the sum is 36.

The square root of 18545418 is about 4306.4391322762. The cubic root of 18545418 is about 264.6948808151.

Adding to 18545418 its reverse (81454581), we get a palindrome (99999999).

The spelling of 18545418 in words is "eighteen million, five hundred forty-five thousand, four hundred eighteen".