18944973 has 12 divisors (see below), whose sum is σ = 27648348. Its totient is φ = 12499200.

The previous prime is 18944927. The next prime is 18944977. The reversal of 18944973 is 37944981.

It can be written as a sum of positive squares in 2 ways, for example, as 12981609 + 5963364 = 3603^2 + 2442^2 .

It is not a de Polignac number, because 18944973 - 2⁶ = 18944909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18944977) 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 11 ways as a sum of consecutive naturals, for example, 9978 + ... + 11723.

It is an arithmetic number, because the mean of its divisors is an integer number (2304029).

Almost surely, 2^18944973 is an apocalyptic number.

It is an amenable number.

18944973 is a deficient number, since it is larger than the sum of its proper divisors (8703375).

18944973 is a wasteful number, since it uses less digits than its factorization.

18944973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21804 (or 21801 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 18944973 is about 4352.5823369581. The cubic root of 18944973 is about 266.5823120342.

The spelling of 18944973 in words is "eighteen million, nine hundred forty-four thousand, nine hundred seventy-three".