18228735 has 48 divisors (see below), whose sum is σ = 36878400. Its totient is φ = 8326080.

The previous prime is 18228703. The next prime is 18228797. The reversal of 18228735 is 53782281.

It is not a de Polignac number, because 18228735 - 2⁵ = 18228703 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18228735.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14845 + ... + 16025.

It is an arithmetic number, because the mean of its divisors is an integer number (768300).

Almost surely, 2^18228735 is an apocalyptic number.

18228735 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18228735 is an abundant number, since it is smaller than the sum of its proper divisors (18649665).

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

18228735 is a wasteful number, since it uses less digits than its factorization.

18228735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213 (or 1196 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 18228735 is about 4269.5122672268. The cubic root of 18228735 is about 263.1795725055.

The spelling of 18228735 in words is "eighteen million, two hundred twenty-eight thousand, seven hundred thirty-five".