189968887 has 2 divisors, whose sum is σ = 189968888. Its totient is φ = 189968886.

The previous prime is 189968881. The next prime is 189968893. The reversal of 189968887 is 788869981.

It is a balanced prime because it is at equal distance from previous prime (189968881) and next prime (189968893).

It is a cyclic number.

It is not a de Polignac number, because 189968887 - 2¹⁵ = 189936119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189968881) 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, 94984443 + 94984444.

It is an arithmetic number, because the mean of its divisors is an integer number (94984444).

Almost surely, 2^189968887 is an apocalyptic number.

189968887 is a deficient number, since it is larger than the sum of its proper divisors (1).

189968887 is an equidigital number, since it uses as much as digits as its factorization.

189968887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13934592, while the sum is 64.

The square root of 189968887 is about 13782.9201187557. The cubic root of 189968887 is about 574.8583262806.

The spelling of 189968887 in words is "one hundred eighty-nine million, nine hundred sixty-eight thousand, eight hundred eighty-seven".