18103428 has 108 divisors (see below), whose sum is σ = 55473600. Its totient is φ = 4875552.

The previous prime is 18103373. The next prime is 18103433. The reversal of 18103428 is 82430181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 90873 + ... + 91071.

Almost surely, 2^18103428 is an apocalyptic number.

18103428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18103428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27736800).

18103428 is an abundant number, since it is smaller than the sum of its proper divisors (37370172).

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

18103428 is a wasteful number, since it uses less digits than its factorization.

18103428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254 (or 230 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 18103428 is about 4254.8123342869. The cubic root of 18103428 is about 262.5751403938.

The spelling of 18103428 in words is "eighteen million, one hundred three thousand, four hundred twenty-eight".