19944937 has 2 divisors, whose sum is σ = 19944938. Its totient is φ = 19944936.

The previous prime is 19944917. The next prime is 19944943. The reversal of 19944937 is 73944991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15848361 + 4096576 = 3981^2 + 2024^2 .

It is an emirp because it is prime and its reverse (73944991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19944937 is a prime.

It is not a weakly prime, because it can be changed into another prime (19944917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9972468 + 9972469.

It is an arithmetic number, because the mean of its divisors is an integer number (9972469).

Almost surely, 2^19944937 is an apocalyptic number.

It is an amenable number.

19944937 is a deficient number, since it is larger than the sum of its proper divisors (1).

19944937 is an equidigital number, since it uses as much as digits as its factorization.

19944937 is an evil number, because the sum of its binary digits is even.

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

The square root of 19944937 is about 4465.9754813478. The cubic root of 19944937 is about 271.1924260712.

The spelling of 19944937 in words is "nineteen million, nine hundred forty-four thousand, nine hundred thirty-seven".