18280732 has 12 divisors (see below), whose sum is σ = 32225760. Its totient is φ = 9073376.

The previous prime is 18280727. The next prime is 18280739. The reversal of 18280732 is 23708281.

It is a junction number, because it is equal to n+sod(n) for n = 18280694 and 18280703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18280739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16132 + ... + 17227.

It is an arithmetic number, because the mean of its divisors is an integer number (2685480).

Almost surely, 2^18280732 is an apocalyptic number.

It is an amenable number.

18280732 is a deficient number, since it is larger than the sum of its proper divisors (13945028).

18280732 is a wasteful number, since it uses less digits than its factorization.

18280732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33500 (or 33498 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 18280732 is about 4275.5972682188. The cubic root of 18280732 is about 263.4295726143.

The spelling of 18280732 in words is "eighteen million, two hundred eighty thousand, seven hundred thirty-two".