181904 has 10 divisors (see below), whose sum is σ = 352470. Its totient is φ = 90944.

The previous prime is 181903. The next prime is 181913. The reversal of 181904 is 409181.

It can be written as a sum of positive squares in only one way, i.e., 160000 + 21904 = 400^2 + 148^2 .

It is a nialpdrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 181904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181903) 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 as a sum of consecutive naturals, namely, 5669 + ... + 5700.

It is an arithmetic number, because the mean of its divisors is an integer number (35247).

2¹⁸¹⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

181904 is a deficient number, since it is larger than the sum of its proper divisors (170566).

181904 is a wasteful number, since it uses less digits than its factorization.

181904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11377 (or 11371 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 181904 is about 426.5020515777. The cubic root of 181904 is about 56.6605452826.

The spelling of 181904 in words is "one hundred eighty-one thousand, nine hundred four".