181904144 has 10 divisors (see below), whose sum is σ = 352439310. Its totient is φ = 90952064.

The previous prime is 181904141. The next prime is 181904159. The reversal of 181904144 is 441409181.

It can be written as a sum of positive squares in only one way, i.e., 119683600 + 62220544 = 10940^2 + 7888^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 181904144.

It is not an unprimeable number, because it can be changed into a prime (181904141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5684489 + ... + 5684520.

It is an arithmetic number, because the mean of its divisors is an integer number (35243931).

Almost surely, 2^181904144 is an apocalyptic number.

It is an amenable number.

181904144 is a deficient number, since it is larger than the sum of its proper divisors (170535166).

181904144 is a wasteful number, since it uses less digits than its factorization.

181904144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11369017 (or 11369011 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 181904144 is about 13487.1844356040. The cubic root of 181904144 is about 566.6056023396.

The spelling of 181904144 in words is "one hundred eighty-one million, nine hundred four thousand, one hundred forty-four".