181806 has 16 divisors (see below), whose sum is σ = 367824. Its totient is φ = 59904.

The previous prime is 181789. The next prime is 181813. The reversal of 181806 is 608181.

181806 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 181806.

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, 846 + ... + 1038.

It is an arithmetic number, because the mean of its divisors is an integer number (22989).

2¹⁸¹⁸⁰⁶ is an apocalyptic number.

181806 is an abundant number, since it is smaller than the sum of its proper divisors (186018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

181806 is a wasteful number, since it uses less digits than its factorization.

181806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 181806 is about 426.3871480240. The cubic root of 181806 is about 56.6503682462.

Adding to 181806 its reverse (608181), we get a palindrome (789987).

The spelling of 181806 in words is "one hundred eighty-one thousand, eight hundred six".