18200844 has 72 divisors (see below), whose sum is σ = 48642048. Its totient is φ = 5729760.

The previous prime is 18200827. The next prime is 18200849. The reversal of 18200844 is 44800281.

It is not an unprimeable number, because it can be changed into a prime (18200849) 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 23 ways as a sum of consecutive naturals, for example, 52279 + ... + 52625.

It is an arithmetic number, because the mean of its divisors is an integer number (675584).

Almost surely, 2^18200844 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18200844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24321024).

18200844 is an abundant number, since it is smaller than the sum of its proper divisors (30441204).

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

18200844 is a wasteful number, since it uses less digits than its factorization.

18200844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435 (or 430 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 18200844 is about 4266.2447187193. The cubic root of 18200844 is about 263.0452774240.

It can be divided in two parts, 18200 and 844, that added together give a square (19044 = 138²).

The spelling of 18200844 in words is "eighteen million, two hundred thousand, eight hundred forty-four".