19442939 has 2 divisors, whose sum is σ = 19442940. Its totient is φ = 19442938.

The previous prime is 19442881. The next prime is 19442953. The reversal of 19442939 is 93924491.

It is a strong prime.

It is an emirp because it is prime and its reverse (93924491) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19442939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19442896 and 19442905.

It is not a weakly prime, because it can be changed into another prime (19442959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9721469 + 9721470.

It is an arithmetic number, because the mean of its divisors is an integer number (9721470).

Almost surely, 2^19442939 is an apocalyptic number.

19442939 is a deficient number, since it is larger than the sum of its proper divisors (1).

19442939 is an equidigital number, since it uses as much as digits as its factorization.

19442939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 41.

The square root of 19442939 is about 4409.4148137820. The cubic root of 19442939 is about 268.8978343663.

The spelling of 19442939 in words is "nineteen million, four hundred forty-two thousand, nine hundred thirty-nine".