181232730 has 48 divisors (see below), whose sum is σ = 538521984. Its totient is φ = 41424480.

The previous prime is 181232713. The next prime is 181232749. The reversal of 181232730 is 37232181.

181232730 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 181232694 and 181232703.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 143206 + ... + 144465.

It is an arithmetic number, because the mean of its divisors is an integer number (11219208).

Almost surely, 2^181232730 is an apocalyptic number.

181232730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181232730 is an abundant number, since it is smaller than the sum of its proper divisors (357289254).

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

181232730 is a wasteful number, since it uses less digits than its factorization.

181232730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287691 (or 287688 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 181232730 is about 13462.2706108591. The cubic root of 181232730 is about 565.9076230932.

The spelling of 181232730 in words is "one hundred eighty-one million, two hundred thirty-two thousand, seven hundred thirty".