85987 has 4 divisors (see below), whose sum is σ = 93816. Its totient is φ = 78160.

The previous prime is 85933. The next prime is 85991. The reversal of 85987 is 78958.

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 85987 - 2¹¹ = 83939 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (85087) 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, 3898 + ... + 3919.

It is an arithmetic number, because the mean of its divisors is an integer number (23454).

2⁸⁵⁹⁸⁷ is an apocalyptic number.

85987 is a deficient number, since it is larger than the sum of its proper divisors (7829).

85987 is a wasteful number, since it uses less digits than its factorization.

85987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7828.

The product of its digits is 20160, while the sum is 37.

The square root of 85987 is about 293.2354003186. The cubic root of 85987 is about 44.1378254013.

It can be divided in two parts, 859 and 87, that added together give a triangular number (946 = T₄₃).

The spelling of 85987 in words is "eighty-five thousand, nine hundred eighty-seven".