128187 has 6 divisors (see below), whose sum is σ = 185172. Its totient is φ = 85452.

The previous prime is 128173. The next prime is 128189. The reversal of 128187 is 781821.

128187 is nontrivially palindromic in base 8.

It is not a de Polignac number, because 128187 - 2⁸ = 127931 is a prime.

128187 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 128187.

It is not an unprimeable number, because it can be changed into a prime (128189) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7113 + ... + 7130.

It is an arithmetic number, because the mean of its divisors is an integer number (30862).

2¹²⁸¹⁸⁷ is an apocalyptic number.

128187 is a deficient number, since it is larger than the sum of its proper divisors (56985).

128187 is a wasteful number, since it uses less digits than its factorization.

128187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14249 (or 14246 counting only the distinct ones).

The product of its digits is 896, while the sum is 27.

The square root of 128187 is about 358.0321214640. The cubic root of 128187 is about 50.4213722661.

The spelling of 128187 in words is "one hundred twenty-eight thousand, one hundred eighty-seven".