181885 has 8 divisors (see below), whose sum is σ = 238176. Its totient is φ = 132240.

The previous prime is 181873. The next prime is 181889. The reversal of 181885 is 588181.

It is a happy number.

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

It is not a de Polignac number, because 181885 - 2⁷ = 181757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1599 + ... + 1708.

It is an arithmetic number, because the mean of its divisors is an integer number (29772).

2¹⁸¹⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

181885 is a deficient number, since it is larger than the sum of its proper divisors (56291).

181885 is a wasteful number, since it uses less digits than its factorization.

181885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3323.

The product of its digits is 2560, while the sum is 31.

The square root of 181885 is about 426.4797767773. The cubic root of 181885 is about 56.6585724694.

It can be divided in two parts, 18 and 1885, that multiplied together give a triangular number (33930 = T₂₆₀).

The spelling of 181885 in words is "one hundred eighty-one thousand, eight hundred eighty-five".