18445518 has 48 divisors (see below), whose sum is σ = 49192416. Its totient is φ = 4864320.

The previous prime is 18445501. The next prime is 18445519. The reversal of 18445518 is 81554481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18445519) 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 23 ways as a sum of consecutive naturals, for example, 3993 + ... + 7268.

It is an arithmetic number, because the mean of its divisors is an integer number (1024842).

Almost surely, 2^18445518 is an apocalyptic number.

18445518 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18445518 is an abundant number, since it is smaller than the sum of its proper divisors (30746898).

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

18445518 is a wasteful number, since it uses less digits than its factorization.

18445518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11289 (or 11286 counting only the distinct ones).

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

The square root of 18445518 is about 4294.8245598627. The cubic root of 18445518 is about 264.2187408854.

Adding to 18445518 its reverse (81554481), we get a palindrome (99999999).

The spelling of 18445518 in words is "eighteen million, four hundred forty-five thousand, five hundred eighteen".