19994323 has 2 divisors, whose sum is σ = 19994324. Its totient is φ = 19994322.

The previous prime is 19994321. The next prime is 19994353. The reversal of 19994323 is 32349991.

It is a weak prime.

It is an emirp because it is prime and its reverse (32349991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19994323 - 2¹ = 19994321 is a prime.

Together with 19994321, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19994321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9997161 + 9997162.

It is an arithmetic number, because the mean of its divisors is an integer number (9997162).

Almost surely, 2^19994323 is an apocalyptic number.

19994323 is a deficient number, since it is larger than the sum of its proper divisors (1).

19994323 is an equidigital number, since it uses as much as digits as its factorization.

19994323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 40.

The square root of 19994323 is about 4471.5012020573. The cubic root of 19994323 is about 271.4160763144.

The spelling of 19994323 in words is "nineteen million, nine hundred ninety-four thousand, three hundred twenty-three".