19944939 has 8 divisors (see below), whose sum is σ = 30392320. Its totient is φ = 11397096.

The previous prime is 19944937. The next prime is 19944943. The reversal of 19944939 is 93944991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19944939 - 2¹ = 19944937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19944937) 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 7 ways as a sum of consecutive naturals, for example, 474859 + ... + 474900.

It is an arithmetic number, because the mean of its divisors is an integer number (3799040).

Almost surely, 2^19944939 is an apocalyptic number.

19944939 is a deficient number, since it is larger than the sum of its proper divisors (10447381).

19944939 is an equidigital number, since it uses as much as digits as its factorization.

19944939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949769.

The product of its digits is 314928, while the sum is 48.

The square root of 19944939 is about 4465.9757052631. The cubic root of 19944939 is about 271.1924351359.

The spelling of 19944939 in words is "nineteen million, nine hundred forty-four thousand, nine hundred thirty-nine".