19890874727 has 2 divisors, whose sum is σ = 19890874728. Its totient is φ = 19890874726.

The previous prime is 19890874673. The next prime is 19890874739. The reversal of 19890874727 is 72747809891.

It is a strong prime.

It is an emirp because it is prime and its reverse (72747809891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19890874727 - 2¹² = 19890870631 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19890874727.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19890874777) 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, 9945437363 + 9945437364.

It is an arithmetic number, because the mean of its divisors is an integer number (9945437364).

Almost surely, 2^19890874727 is an apocalyptic number.

19890874727 is a deficient number, since it is larger than the sum of its proper divisors (1).

19890874727 is an equidigital number, since it uses as much as digits as its factorization.

19890874727 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14224896, while the sum is 62.

The spelling of 19890874727 in words is "nineteen billion, eight hundred ninety million, eight hundred seventy-four thousand, seven hundred twenty-seven".