19968187 has 2 divisors, whose sum is σ = 19968188. Its totient is φ = 19968186.

The previous prime is 19968181. The next prime is 19968191. The reversal of 19968187 is 78186991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19968187 - 2¹⁹ = 19443899 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19968187.

It is not a weakly prime, because it can be changed into another prime (19968181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9984093 + 9984094.

It is an arithmetic number, because the mean of its divisors is an integer number (9984094).

Almost surely, 2^19968187 is an apocalyptic number.

19968187 is a deficient number, since it is larger than the sum of its proper divisors (1).

19968187 is an equidigital number, since it uses as much as digits as its factorization.

19968187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 49.

The square root of 19968187 is about 4468.5777379385. The cubic root of 19968187 is about 271.2977623356.

It can be divided in two parts, 199 and 68187, that added together give a palindrome (68386).

The spelling of 19968187 in words is "nineteen million, nine hundred sixty-eight thousand, one hundred eighty-seven".