18818944 has 32 divisors (see below), whose sum is σ = 37711440. Its totient is φ = 9354240.

The previous prime is 18818939. The next prime is 18819007. The reversal of 18818944 is 44981881.

18818944 = T₄₇₇ + T₄₇₈ + ... + T₆₀₄.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 18818944.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 29509 + ... + 30139.

Almost surely, 2^18818944 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 18818944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18855720).

18818944 is an abundant number, since it is smaller than the sum of its proper divisors (18892496).

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

18818944 is an equidigital number, since it uses as much as digits as its factorization.

18818944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878 (or 866 counting only the distinct ones).

The product of its digits is 73728, while the sum is 43.

The square root of 18818944 is about 4338.0806815918. The cubic root of 18818944 is about 265.9898614863.

The spelling of 18818944 in words is "eighteen million, eight hundred eighteen thousand, nine hundred forty-four".