180989 has 6 divisors (see below), whose sum is σ = 189630. Its totient is φ = 172536.

The previous prime is 180959. The next prime is 181001. The reversal of 180989 is 989081.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 156025 + 24964 = 395^2 + 158^2 .

It is a de Polignac number, because none of the positive numbers 2^k-180989 is a prime.

It is a Duffinian number.

It is a Curzon number.

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 180989.

It is not an unprimeable number, because it can be changed into a prime (180949) 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, 2252 + ... + 2330.

It is an arithmetic number, because the mean of its divisors is an integer number (31605).

2¹⁸⁰⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

180989 is a deficient number, since it is larger than the sum of its proper divisors (8641).

180989 is an frugal number, since it uses more digits than its factorization.

180989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187 (or 108 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 180989 is about 425.4280197636. The cubic root of 180989 is about 56.5653823201.

The spelling of 180989 in words is "one hundred eighty thousand, nine hundred eighty-nine".