18308384 has 12 divisors (see below), whose sum is σ = 36044694. Its totient is φ = 9154176.

The previous prime is 18308369. The next prime is 18308387. The reversal of 18308384 is 48380381.

It can be written as a sum of positive squares in only one way, i.e., 14227984 + 4080400 = 3772^2 + 2020^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18308387) 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, 286037 + ... + 286100.

Almost surely, 2^18308384 is an apocalyptic number.

It is an amenable number.

18308384 is a deficient number, since it is larger than the sum of its proper divisors (17736310).

18308384 is an equidigital number, since it uses as much as digits as its factorization.

18308384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572147 (or 572139 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 18308384 is about 4278.8297465545. The cubic root of 18308384 is about 263.5623296028.

The spelling of 18308384 in words is "eighteen million, three hundred eight thousand, three hundred eighty-four".