18418660 has 24 divisors (see below), whose sum is σ = 41655096. Its totient is φ = 6800640.

The previous prime is 18418649. The next prime is 18418669. The reversal of 18418660 is 6681481.

It can be written as a sum of positive squares in 4 ways, for example, as 254016 + 18164644 = 504^2 + 4262^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18418669) 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, 35161 + ... + 35680.

It is an arithmetic number, because the mean of its divisors is an integer number (1735629).

Almost surely, 2^18418660 is an apocalyptic number.

18418660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18418660 is an abundant number, since it is smaller than the sum of its proper divisors (23236436).

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

18418660 is a wasteful number, since it uses less digits than its factorization.

18418660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70863 (or 70861 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 18418660 is about 4291.6966341996. The cubic root of 18418660 is about 264.0904381000.

It can be divided in two parts, 1841 and 8660, that added together give a palindrome (10501).

The spelling of 18418660 in words is "eighteen million, four hundred eighteen thousand, six hundred sixty".