19704389 has 2 divisors, whose sum is σ = 19704390. Its totient is φ = 19704388.

The previous prime is 19704367. The next prime is 19704439. The reversal of 19704389 is 98340791.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19651489 + 52900 = 4433^2 + 230^2 .

It is a cyclic number.

It is not a de Polignac number, because 19704389 - 2¹² = 19700293 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19704319) 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, 9852194 + 9852195.

It is an arithmetic number, because the mean of its divisors is an integer number (9852195).

Almost surely, 2^19704389 is an apocalyptic number.

It is an amenable number.

19704389 is a deficient number, since it is larger than the sum of its proper divisors (1).

19704389 is an equidigital number, since it uses as much as digits as its factorization.

19704389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 19704389 is about 4438.9626040326. The cubic root of 19704389 is about 270.0977652357.

The spelling of 19704389 in words is "nineteen million, seven hundred four thousand, three hundred eighty-nine".