180506 has 8 divisors (see below), whose sum is σ = 286740. Its totient is φ = 84928.

The previous prime is 180503. The next prime is 180511. The reversal of 180506 is 605081.

It can be written as a sum of positive squares in 2 ways, for example, as 172225 + 8281 = 415^2 + 91^2 .

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

It is a Curzon number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (180503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2621 + ... + 2688.

2¹⁸⁰⁵⁰⁶ is an apocalyptic number.

180506 is a deficient number, since it is larger than the sum of its proper divisors (106234).

180506 is a wasteful number, since it uses less digits than its factorization.

180506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5328.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 180506 is about 424.8599769336. The cubic root of 180506 is about 56.5150193709.

Adding to 180506 its reverse (605081), we get a palindrome (785587).

It can be divided in two parts, 180 and 506, that added together give a palindrome (686).

The spelling of 180506 in words is "one hundred eighty thousand, five hundred six".