18328730 has 32 divisors (see below), whose sum is σ = 39692160. Its totient is φ = 5952960.

The previous prime is 18328729. The next prime is 18328759. The reversal of 18328730 is 3782381.

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 15 ways as a sum of consecutive naturals, for example, 5561 + ... + 8220.

It is an arithmetic number, because the mean of its divisors is an integer number (1240380).

Almost surely, 2^18328730 is an apocalyptic number.

18328730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18328730 is an abundant number, since it is smaller than the sum of its proper divisors (21363430).

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

18328730 is a wasteful number, since it uses less digits than its factorization.

18328730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13814.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 18328730 is about 4281.2066056195. The cubic root of 18328730 is about 263.6599252174.

The spelling of 18328730 in words is "eighteen million, three hundred twenty-eight thousand, seven hundred thirty".