19690939 has 2 divisors, whose sum is σ = 19690940. Its totient is φ = 19690938.

The previous prime is 19690933. The next prime is 19690943. The reversal of 19690939 is 93909691.

It is a strong prime.

It is an emirp because it is prime and its reverse (93909691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19690939 - 2¹¹ = 19688891 is a prime.

It is not a weakly prime, because it can be changed into another prime (19690933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9845469 + 9845470.

It is an arithmetic number, because the mean of its divisors is an integer number (9845470).

Almost surely, 2^19690939 is an apocalyptic number.

19690939 is a deficient number, since it is larger than the sum of its proper divisors (1).

19690939 is an equidigital number, since it uses as much as digits as its factorization.

19690939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 118098, while the sum is 46.

The square root of 19690939 is about 4437.4473518004. The cubic root of 19690939 is about 270.0362959893.

The spelling of 19690939 in words is "nineteen million, six hundred ninety thousand, nine hundred thirty-nine".