87189 has 4 divisors (see below), whose sum is σ = 116256. Its totient is φ = 58124.

The previous prime is 87187. The next prime is 87211. The reversal of 87189 is 98178.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87189 - 2¹ = 87187 is a prime.

It is a D-number.

It is a plaindrome in base 14.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 87189.

It is not an unprimeable number, because it can be changed into a prime (87181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14529 + ... + 14534.

It is an arithmetic number, because the mean of its divisors is an integer number (29064).

2⁸⁷¹⁸⁹ is an apocalyptic number.

It is an amenable number.

87189 is a deficient number, since it is larger than the sum of its proper divisors (29067).

87189 is a wasteful number, since it uses less digits than its factorization.

87189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29066.

The product of its digits is 4032, while the sum is 33.

The square root of 87189 is about 295.2778352671. The cubic root of 87189 is about 44.3425399062.

It can be divided in two parts, 87 and 189, that added together give a triangular number (276 = T₂₃).

The spelling of 87189 in words is "eighty-seven thousand, one hundred eighty-nine".