19973944 has 8 divisors (see below), whose sum is σ = 37451160. Its totient is φ = 9986968.

The previous prime is 19973939. The next prime is 19973971. The reversal of 19973944 is 44937991.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 19973894 and 19973903.

It is a congruent number.

It is an unprimeable number.

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, 1248364 + ... + 1248379.

It is an arithmetic number, because the mean of its divisors is an integer number (4681395).

Almost surely, 2^19973944 is an apocalyptic number.

It is an amenable number.

19973944 is a deficient number, since it is larger than the sum of its proper divisors (17477216).

19973944 is a wasteful number, since it uses less digits than its factorization.

19973944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2496749 (or 2496745 counting only the distinct ones).

The product of its digits is 244944, while the sum is 46.

The square root of 19973944 is about 4469.2218562072. The cubic root of 19973944 is about 271.3238323228.

The spelling of 19973944 in words is "nineteen million, nine hundred seventy-three thousand, nine hundred forty-four".