19699423 has 2 divisors, whose sum is σ = 19699424. Its totient is φ = 19699422.

The previous prime is 19699417. The next prime is 19699441. The reversal of 19699423 is 32499691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19699423 - 2⁵ = 19699391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19699423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19699453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9849711 + 9849712.

It is an arithmetic number, because the mean of its divisors is an integer number (9849712).

Almost surely, 2^19699423 is an apocalyptic number.

19699423 is a deficient number, since it is larger than the sum of its proper divisors (1).

19699423 is an equidigital number, since it uses as much as digits as its factorization.

19699423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 43.

The square root of 19699423 is about 4438.4032038561. The cubic root of 19699423 is about 270.0750728599.

The spelling of 19699423 in words is "nineteen million, six hundred ninety-nine thousand, four hundred twenty-three".