19768387 has 2 divisors, whose sum is σ = 19768388. Its totient is φ = 19768386.

The previous prime is 19768373. The next prime is 19768391. The reversal of 19768387 is 78386791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19768387 - 2¹¹ = 19766339 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19768387.

It is not a weakly prime, because it can be changed into another prime (19768367) 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, 9884193 + 9884194.

It is an arithmetic number, because the mean of its divisors is an integer number (9884194).

Almost surely, 2^19768387 is an apocalyptic number.

19768387 is a deficient number, since it is larger than the sum of its proper divisors (1).

19768387 is an equidigital number, since it uses as much as digits as its factorization.

19768387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 49.

The square root of 19768387 is about 4446.1654265220. The cubic root of 19768387 is about 270.3898665936.

The spelling of 19768387 in words is "nineteen million, seven hundred sixty-eight thousand, three hundred eighty-seven".