19938443 has 6 divisors (see below), whose sum is σ = 23193756. Its totient is φ = 17090052.

The previous prime is 19938437. The next prime is 19938469. The reversal of 19938443 is 34483991.

It is not a de Polignac number, because 19938443 - 2⁶ = 19938379 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19938443.

It is not an unprimeable number, because it can be changed into a prime (19938473) 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 5 ways as a sum of consecutive naturals, for example, 203405 + ... + 203502.

It is an arithmetic number, because the mean of its divisors is an integer number (3865626).

Almost surely, 2^19938443 is an apocalyptic number.

19938443 is a deficient number, since it is larger than the sum of its proper divisors (3255313).

19938443 is an equidigital number, since it uses as much as digits as its factorization.

19938443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406921 (or 406914 counting only the distinct ones).

The product of its digits is 93312, while the sum is 41.

The square root of 19938443 is about 4465.2483693519. The cubic root of 19938443 is about 271.1629897822.

The spelling of 19938443 in words is "nineteen million, nine hundred thirty-eight thousand, four hundred forty-three".