181789472 has 12 divisors (see below), whose sum is σ = 357898086. Its totient is φ = 90894720.

The previous prime is 181789463. The next prime is 181789477. The reversal of 181789472 is 274987181.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 180526096 + 1263376 = 13436^2 + 1124^2 .

It is not an unprimeable number, because it can be changed into a prime (181789477) 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, 2840429 + ... + 2840492.

Almost surely, 2^181789472 is an apocalyptic number.

It is an amenable number.

181789472 is a deficient number, since it is larger than the sum of its proper divisors (176108614).

181789472 is an equidigital number, since it uses as much as digits as its factorization.

181789472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5680931 (or 5680923 counting only the distinct ones).

The product of its digits is 225792, while the sum is 47.

The square root of 181789472 is about 13482.9326186850. The cubic root of 181789472 is about 566.4865149746.

The spelling of 181789472 in words is "one hundred eighty-one million, seven hundred eighty-nine thousand, four hundred seventy-two".