19944943 has 2 divisors, whose sum is σ = 19944944. Its totient is φ = 19944942.

The previous prime is 19944937. The next prime is 19944973. The reversal of 19944943 is 34944991.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19944943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19944943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19944913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9972471 + 9972472.

It is an arithmetic number, because the mean of its divisors is an integer number (9972472).

Almost surely, 2^19944943 is an apocalyptic number.

19944943 is a deficient number, since it is larger than the sum of its proper divisors (1).

19944943 is an equidigital number, since it uses as much as digits as its factorization.

19944943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 43.

The square root of 19944943 is about 4465.9761530935. The cubic root of 19944943 is about 271.1924532653.

The spelling of 19944943 in words is "nineteen million, nine hundred forty-four thousand, nine hundred forty-three".