19944423 has 6 divisors (see below), whose sum is σ = 28808624. Its totient is φ = 13296276.

The previous prime is 19944391. The next prime is 19944469. The reversal of 19944423 is 32444991.

19944423 is a `hidden beast` number, since 199 + 44 + 423 = 666.

It is not a de Polignac number, because 19944423 - 2⁵ = 19944391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19940423) 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, 1108015 + ... + 1108032.

Almost surely, 2^19944423 is an apocalyptic number.

19944423 is a deficient number, since it is larger than the sum of its proper divisors (8864201).

19944423 is a wasteful number, since it uses less digits than its factorization.

19944423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2216053 (or 2216050 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 19944423 is about 4465.9179347588. The cubic root of 19944423 is about 271.1900964222.

The spelling of 19944423 in words is "nineteen million, nine hundred forty-four thousand, four hundred twenty-three".