189887 has 2 divisors, whose sum is σ = 189888. Its totient is φ = 189886.

The previous prime is 189881. The next prime is 189901. The reversal of 189887 is 788981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 189887 - 2⁶ = 189823 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94943 + 94944.

It is an arithmetic number, because the mean of its divisors is an integer number (94944).

2¹⁸⁹⁸⁸⁷ is an apocalyptic number.

189887 is a deficient number, since it is larger than the sum of its proper divisors (1).

189887 is an equidigital number, since it uses as much as digits as its factorization.

189887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 41.

The square root of 189887 is about 435.7602551863. The cubic root of 189887 is about 57.4775715930.

The spelling of 189887 in words is "one hundred eighty-nine thousand, eight hundred eighty-seven".