18818900 has 18 divisors (see below), whose sum is σ = 40837230. Its totient is φ = 7527520.

The previous prime is 18818867. The next prime is 18818909. The reversal of 18818900 is 981881.

It can be written as a sum of positive squares in 3 ways, for example, as 35344 + 18783556 = 188^2 + 4334^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18818909) 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 5 ways as a sum of consecutive naturals, for example, 93995 + ... + 94194.

It is an arithmetic number, because the mean of its divisors is an integer number (2268735).

Almost surely, 2^18818900 is an apocalyptic number.

18818900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18818900 is an abundant number, since it is smaller than the sum of its proper divisors (22018330).

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

18818900 is a wasteful number, since it uses less digits than its factorization.

18818900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188203 (or 188196 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 35.

The square root of 18818900 is about 4338.0756102217. The cubic root of 18818900 is about 265.9896541852.

The spelling of 18818900 in words is "eighteen million, eight hundred eighteen thousand, nine hundred".