180865 has 8 divisors (see below), whose sum is σ = 220968. Its totient is φ = 142080.

The previous prime is 180847. The next prime is 180871. The reversal of 180865 is 568081.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1089 + 179776 = 33^2 + 424^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 180865 - 2¹¹ = 178817 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9 + ... + 601.

It is an arithmetic number, because the mean of its divisors is an integer number (27621).

2¹⁸⁰⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

180865 is a deficient number, since it is larger than the sum of its proper divisors (40103).

180865 is an equidigital number, since it uses as much as digits as its factorization.

180865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 180865 is about 425.2822592115. The cubic root of 180865 is about 56.5524612588.

The spelling of 180865 in words is "one hundred eighty thousand, eight hundred sixty-five".