180806 has 4 divisors (see below), whose sum is σ = 271212. Its totient is φ = 90402.

The previous prime is 180799. The next prime is 180811. The reversal of 180806 is 608081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 608081 = 107 ⋅5683.

It is an Ulam number.

It is a plaindrome in base 15.

It is a nialpdrome in base 12.

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 180806.

It is an unprimeable number.

180806 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 45200 + ... + 45203.

It is an arithmetic number, because the mean of its divisors is an integer number (67803).

2¹⁸⁰⁸⁰⁶ is an apocalyptic number.

180806 is a deficient number, since it is larger than the sum of its proper divisors (90406).

180806 is an equidigital number, since it uses as much as digits as its factorization.

180806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90405.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 180806 is about 425.2128878574. The cubic root of 180806 is about 56.5463112610.

Adding to 180806 its reverse (608081), we get a palindrome (788887).

The spelling of 180806 in words is "one hundred eighty thousand, eight hundred six".