183989 has 4 divisors (see below), whose sum is σ = 198156. Its totient is φ = 169824.

The previous prime is 183979. The next prime is 184003. The reversal of 183989 is 989381.

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

It can be written as a sum of positive squares in 2 ways, for example, as 47089 + 136900 = 217^2 + 370^2 .

It is a cyclic number.

It is not a de Polignac number, because 183989 - 2⁴ = 183973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (183919) 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, 7064 + ... + 7089.

It is an arithmetic number, because the mean of its divisors is an integer number (49539).

2¹⁸³⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

183989 is a deficient number, since it is larger than the sum of its proper divisors (14167).

183989 is a wasteful number, since it uses less digits than its factorization.

183989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14166.

The product of its digits is 15552, while the sum is 38.

The square root of 183989 is about 428.9393896578. The cubic root of 183989 is about 56.8762061492.

The spelling of 183989 in words is "one hundred eighty-three thousand, nine hundred eighty-nine".