18305732 has 6 divisors (see below), whose sum is σ = 32035038. Its totient is φ = 9152864.

The previous prime is 18305731. The next prime is 18305737. The reversal of 18305732 is 23750381.

It can be written as a sum of positive squares in only one way, i.e., 15007876 + 3297856 = 3874^2 + 1816^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18305695 and 18305704.

It is not an unprimeable number, because it can be changed into a prime (18305731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2288213 + ... + 2288220.

It is an arithmetic number, because the mean of its divisors is an integer number (5339173).

Almost surely, 2^18305732 is an apocalyptic number.

It is an amenable number.

18305732 is a deficient number, since it is larger than the sum of its proper divisors (13729306).

18305732 is a wasteful number, since it uses less digits than its factorization.

18305732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4576437 (or 4576435 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 18305732 is about 4278.5198375139. The cubic root of 18305732 is about 263.5496031737.

The spelling of 18305732 in words is "eighteen million, three hundred five thousand, seven hundred thirty-two".