19944238 has 4 divisors (see below), whose sum is σ = 29916360. Its totient is φ = 9972118.

The previous prime is 19944233. The next prime is 19944241. The reversal of 19944238 is 83244991.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 19944238.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19944233) 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 as a sum of consecutive naturals, namely, 4986058 + ... + 4986061.

It is an arithmetic number, because the mean of its divisors is an integer number (7479090).

Almost surely, 2^19944238 is an apocalyptic number.

19944238 is a deficient number, since it is larger than the sum of its proper divisors (9972122).

19944238 is an equidigital number, since it uses as much as digits as its factorization.

19944238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9972121.

The product of its digits is 62208, while the sum is 40.

The square root of 19944238 is about 4465.8972222836. The cubic root of 19944238 is about 271.1892579201.

The spelling of 19944238 in words is "nineteen million, nine hundred forty-four thousand, two hundred thirty-eight".