19519928387 has 2 divisors, whose sum is σ = 19519928388. Its totient is φ = 19519928386.

The previous prime is 19519928383. The next prime is 19519928413. The reversal of 19519928387 is 78382991591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19519928387 - 2² = 19519928383 is a prime.

It is not a weakly prime, because it can be changed into another prime (19519928383) 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, 9759964193 + 9759964194.

It is an arithmetic number, because the mean of its divisors is an integer number (9759964194).

Almost surely, 2^19519928387 is an apocalyptic number.

19519928387 is a deficient number, since it is larger than the sum of its proper divisors (1).

19519928387 is an equidigital number, since it uses as much as digits as its factorization.

19519928387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9797760, while the sum is 62.

The spelling of 19519928387 in words is "nineteen billion, five hundred nineteen million, nine hundred twenty-eight thousand, three hundred eighty-seven".