181389472 has 24 divisors (see below), whose sum is σ = 389575872. Its totient is φ = 82449600.

The previous prime is 181389469. The next prime is 181389499. The reversal of 181389472 is 274983181.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 257304 + ... + 258007.

It is an arithmetic number, because the mean of its divisors is an integer number (16232328).

Almost surely, 2^181389472 is an apocalyptic number.

It is an amenable number.

181389472 is an abundant number, since it is smaller than the sum of its proper divisors (208186400).

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

181389472 is a wasteful number, since it uses less digits than its factorization.

181389472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515332 (or 515324 counting only the distinct ones).

The product of its digits is 96768, while the sum is 43.

The square root of 181389472 is about 13468.0908817842. The cubic root of 181389472 is about 566.0707208098.

The spelling of 181389472 in words is "one hundred eighty-one million, three hundred eighty-nine thousand, four hundred seventy-two".