19690943 has 2 divisors, whose sum is σ = 19690944. Its totient is φ = 19690942.

The previous prime is 19690939. The next prime is 19690961. The reversal of 19690943 is 34909691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19690943 - 2² = 19690939 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19690943.

It is a congruent number.

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, 9845471 + 9845472.

It is an arithmetic number, because the mean of its divisors is an integer number (9845472).

Almost surely, 2^19690943 is an apocalyptic number.

19690943 is a deficient number, since it is larger than the sum of its proper divisors (1).

19690943 is an equidigital number, since it uses as much as digits as its factorization.

19690943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 19690943 is about 4437.4478025099. The cubic root of 19690943 is about 270.0363142743.

The spelling of 19690943 in words is "nineteen million, six hundred ninety thousand, nine hundred forty-three".