19944438 has 16 divisors (see below), whose sum is σ = 40543536. Its totient is φ = 6539040.

The previous prime is 19944391. The next prime is 19944469. The reversal of 19944438 is 83444991.

It is a self number, because there is not a number n which added to its sum of digits gives 19944438.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 26881 + ... + 27612.

It is an arithmetic number, because the mean of its divisors is an integer number (2533971).

Almost surely, 2^19944438 is an apocalyptic number.

19944438 is an abundant number, since it is smaller than the sum of its proper divisors (20599098).

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

19944438 is a wasteful number, since it uses less digits than its factorization.

19944438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54559.

The product of its digits is 124416, while the sum is 42.

The square root of 19944438 is about 4465.9196141444. The cubic root of 19944438 is about 271.1901644087.

The spelling of 19944438 in words is "nineteen million, nine hundred forty-four thousand, four hundred thirty-eight".