18103728 has 40 divisors (see below), whose sum is σ = 47126448. Its totient is φ = 5988352.

The previous prime is 18103727. The next prime is 18103739. The reversal of 18103728 is 82730181.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18103695 and 18103704.

It is not an unprimeable number, because it can be changed into a prime (18103727) 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 in 7 ways as a sum of consecutive naturals, for example, 5200 + ... + 7952.

Almost surely, 2^18103728 is an apocalyptic number.

It is an amenable number.

18103728 is an abundant number, since it is smaller than the sum of its proper divisors (29022720).

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

18103728 is a wasteful number, since it uses less digits than its factorization.

18103728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2901 (or 2895 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 18103728 is about 4254.8475883397. The cubic root of 18103728 is about 262.5765908025.

The spelling of 18103728 in words is "eighteen million, one hundred three thousand, seven hundred twenty-eight".