19944189 has 6 divisors (see below), whose sum is σ = 28808286. Its totient is φ = 13296120.

The previous prime is 19944187. The next prime is 19944193. The reversal of 19944189 is 98144991.

It can be written as a sum of positive squares in only one way, i.e., 12425625 + 7518564 = 3525^2 + 2742^2 .

It is not a de Polignac number, because 19944189 - 2¹ = 19944187 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19944187) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1108002 + ... + 1108019.

It is an arithmetic number, because the mean of its divisors is an integer number (4801381).

Almost surely, 2^19944189 is an apocalyptic number.

It is an amenable number.

19944189 is a deficient number, since it is larger than the sum of its proper divisors (8864097).

19944189 is a wasteful number, since it uses less digits than its factorization.

19944189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2216027 (or 2216024 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 19944189 is about 4465.8917362605. The cubic root of 19944189 is about 271.1890358295.

The spelling of 19944189 in words is "nineteen million, nine hundred forty-four thousand, one hundred eighty-nine".