180689 has 4 divisors (see below), whose sum is σ = 182580. Its totient is φ = 178800.

The previous prime is 180679. The next prime is 180701. The reversal of 180689 is 986081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 986081 = 19 ⋅51899.

It can be written as a sum of positive squares in 2 ways, for example, as 172225 + 8464 = 415^2 + 92^2 .

It is a cyclic number.

It is not a de Polignac number, because 180689 - 2¹⁶ = 115153 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (180629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 794 + ... + 995.

It is an arithmetic number, because the mean of its divisors is an integer number (45645).

2¹⁸⁰⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

180689 is a deficient number, since it is larger than the sum of its proper divisors (1891).

180689 is a wasteful number, since it uses less digits than its factorization.

180689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1890.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 180689 is about 425.0752874492. The cubic root of 180689 is about 56.5341115442.

The spelling of 180689 in words is "one hundred eighty thousand, six hundred eighty-nine".