18306730 has 32 divisors (see below), whose sum is σ = 36170064. Its totient is φ = 6629376.

The previous prime is 18306727. The next prime is 18306731. The reversal of 18306730 is 3760381.

It can be written as a sum of positive squares in 8 ways, for example, as 7789681 + 10517049 = 2791^2 + 3243^2 .

It is not an unprimeable number, because it can be changed into a prime (18306731) 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 in 15 ways as a sum of consecutive naturals, for example, 5562 + ... + 8218.

Almost surely, 2^18306730 is an apocalyptic number.

18306730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18306730 is a deficient number, since it is larger than the sum of its proper divisors (17863334).

18306730 is a wasteful number, since it uses less digits than its factorization.

18306730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2730.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 18306730 is about 4278.6364650435. The cubic root of 18306730 is about 263.5543925246.

The spelling of 18306730 in words is "eighteen million, three hundred six thousand, seven hundred thirty".