19964323 has 2 divisors, whose sum is σ = 19964324. Its totient is φ = 19964322.

The previous prime is 19964317. The next prime is 19964333. The reversal of 19964323 is 32346991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19964323 - 2⁵ = 19964291 is a prime.

It is equal to p_1268497 and since 19964323 and 1268497 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (19964333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9982161 + 9982162.

It is an arithmetic number, because the mean of its divisors is an integer number (9982162).

Almost surely, 2^19964323 is an apocalyptic number.

19964323 is a deficient number, since it is larger than the sum of its proper divisors (1).

19964323 is an equidigital number, since it uses as much as digits as its factorization.

19964323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 37.

The square root of 19964323 is about 4468.1453646899. The cubic root of 19964323 is about 271.2802617954.

The spelling of 19964323 in words is "nineteen million, nine hundred sixty-four thousand, three hundred twenty-three".