19940374589 has 2 divisors, whose sum is σ = 19940374590. Its totient is φ = 19940374588.

The previous prime is 19940374537. The next prime is 19940374603. The reversal of 19940374589 is 98547304991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11211209689 + 8729164900 = 105883^2 + 93430^2 .

It is a cyclic number.

It is not a de Polignac number, because 19940374589 - 2¹² = 19940370493 is a prime.

It is a Sophie Germain 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 (19940374189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9970187294 + 9970187295.

It is an arithmetic number, because the mean of its divisors is an integer number (9970187295).

Almost surely, 2^19940374589 is an apocalyptic number.

It is an amenable number.

19940374589 is a deficient number, since it is larger than the sum of its proper divisors (1).

19940374589 is an equidigital number, since it uses as much as digits as its factorization.

19940374589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9797760, while the sum is 59.

The spelling of 19940374589 in words is "nineteen billion, nine hundred forty million, three hundred seventy-four thousand, five hundred eighty-nine".