18044900 has 36 divisors (see below), whose sum is σ = 40223988. Its totient is φ = 7021440.

The previous prime is 18044899. The next prime is 18044933. The reversal of 18044900 is 944081.

It can be written as a sum of positive squares in 6 ways, for example, as 16384 + 18028516 = 128^2 + 4246^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18044900.

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, 1262 + ... + 6138.

It is an arithmetic number, because the mean of its divisors is an integer number (1117333).

Almost surely, 2^18044900 is an apocalyptic number.

18044900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18044900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20111994).

18044900 is an abundant number, since it is smaller than the sum of its proper divisors (22179088).

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

18044900 is a wasteful number, since it uses less digits than its factorization.

18044900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4928 (or 4921 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 18044900 is about 4247.9289071264. The cubic root of 18044900 is about 262.2918682773.

Adding to 18044900 its reverse (944081), we get a palindrome (18988981).

The spelling of 18044900 in words is "eighteen million, forty-four thousand, nine hundred".