189087 has 4 divisors (see below), whose sum is σ = 252120. Its totient is φ = 126056.

The previous prime is 189067. The next prime is 189127. The reversal of 189087 is 780981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 189087 - 2⁸ = 188831 is a prime.

It is a D-number.

189087 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31512 + ... + 31517.

It is an arithmetic number, because the mean of its divisors is an integer number (63030).

2¹⁸⁹⁰⁸⁷ is an apocalyptic number.

189087 is a deficient number, since it is larger than the sum of its proper divisors (63033).

189087 is an equidigital number, since it uses as much as digits as its factorization.

189087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63032.

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

The square root of 189087 is about 434.8413503797. The cubic root of 189087 is about 57.3967396886.

It can be divided in two parts, 18908 and 7, that added together give a triangular number (18915 = T₁₉₄).

The spelling of 189087 in words is "one hundred eighty-nine thousand, eighty-seven".