18944028 has 18 divisors (see below), whose sum is σ = 47886384. Its totient is φ = 6314664.

The previous prime is 18944027. The next prime is 18944033. The reversal of 18944028 is 82044981.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 526223 = 18944028 / (1 + 8 + 9 + 4 + 4 + 0 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 18943983 and 18944001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18944027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 263076 + ... + 263147.

Almost surely, 2^18944028 is an apocalyptic number.

18944028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18944028 is an abundant number, since it is smaller than the sum of its proper divisors (28942356).

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

18944028 is a wasteful number, since it uses less digits than its factorization.

18944028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526233 (or 526228 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 18944028 is about 4352.4737793581. The cubic root of 18944028 is about 266.5778794692.

The spelling of 18944028 in words is "eighteen million, nine hundred forty-four thousand, twenty-eight".