183987 has 6 divisors (see below), whose sum is σ = 265772. Its totient is φ = 122652.

The previous prime is 183979. The next prime is 184003. The reversal of 183987 is 789381.

It is not a de Polignac number, because 183987 - 2³ = 183979 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 183987.

It is not an unprimeable number, because it can be changed into a prime (183907) 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 5 ways as a sum of consecutive naturals, for example, 10213 + ... + 10230.

2¹⁸³⁹⁸⁷ is an apocalyptic number.

183987 is a deficient number, since it is larger than the sum of its proper divisors (81785).

183987 is a wasteful number, since it uses less digits than its factorization.

183987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20449 (or 20446 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 183987 is about 428.9370583197. The cubic root of 183987 is about 56.8760000629.

It can be divided in two parts, 18 and 3987, that added together give a triangular number (4005 = T₈₉).

The spelling of 183987 in words is "one hundred eighty-three thousand, nine hundred eighty-seven".