19823423 has 2 divisors, whose sum is σ = 19823424. Its totient is φ = 19823422.

The previous prime is 19823393. The next prime is 19823429. The reversal of 19823423 is 32432891.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19823423 - 2⁶ = 19823359 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 19823423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19823429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9911711 + 9911712.

It is an arithmetic number, because the mean of its divisors is an integer number (9911712).

Almost surely, 2^19823423 is an apocalyptic number.

19823423 is a deficient number, since it is larger than the sum of its proper divisors (1).

19823423 is an equidigital number, since it uses as much as digits as its factorization.

19823423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 32.

The square root of 19823423 is about 4452.3502782239. The cubic root of 19823423 is about 270.6405595827.

The spelling of 19823423 in words is "nineteen million, eight hundred twenty-three thousand, four hundred twenty-three".