19934689 has 2 divisors, whose sum is σ = 19934690. Its totient is φ = 19934688.

The previous prime is 19934641. The next prime is 19934713. The reversal of 19934689 is 98643991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17918289 + 2016400 = 4233^2 + 1420^2 .

It is a cyclic number.

It is not a de Polignac number, because 19934689 - 2¹¹ = 19932641 is a prime.

It is not a weakly prime, because it can be changed into another prime (19934609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9967344 + 9967345.

It is an arithmetic number, because the mean of its divisors is an integer number (9967345).

Almost surely, 2^19934689 is an apocalyptic number.

It is an amenable number.

19934689 is a deficient number, since it is larger than the sum of its proper divisors (1).

19934689 is an equidigital number, since it uses as much as digits as its factorization.

19934689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 49.

The square root of 19934689 is about 4464.8279922075. The cubic root of 19934689 is about 271.1459705703.

The spelling of 19934689 in words is "nineteen million, nine hundred thirty-four thousand, six hundred eighty-nine".