19696399 has 2 divisors, whose sum is σ = 19696400. Its totient is φ = 19696398.

The previous prime is 19696393. The next prime is 19696403. The reversal of 19696399 is 99369691.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19696399 - 2⁵ = 19696367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19696393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9848199 + 9848200.

It is an arithmetic number, because the mean of its divisors is an integer number (9848200).

Almost surely, 2^19696399 is an apocalyptic number.

19696399 is a deficient number, since it is larger than the sum of its proper divisors (1).

19696399 is an equidigital number, since it uses as much as digits as its factorization.

19696399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 708588, while the sum is 52.

The square root of 19696399 is about 4438.0625277254. The cubic root of 19696399 is about 270.0612526783.

The spelling of 19696399 in words is "nineteen million, six hundred ninety-six thousand, three hundred ninety-nine".