18228385 has 16 divisors (see below), whose sum is σ = 25862400. Its totient is φ = 12067776.

The previous prime is 18228367. The next prime is 18228389. The reversal of 18228385 is 58382281.

It is not a de Polignac number, because 18228385 - 2¹¹ = 18226337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18228389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7965 + ... + 9994.

It is an arithmetic number, because the mean of its divisors is an integer number (1616400).

Almost surely, 2^18228385 is an apocalyptic number.

It is an amenable number.

18228385 is a deficient number, since it is larger than the sum of its proper divisors (7634015).

18228385 is a wasteful number, since it uses less digits than its factorization.

18228385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18000.

The product of its digits is 30720, while the sum is 37.

The square root of 18228385 is about 4269.4712787417. The cubic root of 18228385 is about 263.1778881055.

The spelling of 18228385 in words is "eighteen million, two hundred twenty-eight thousand, three hundred eighty-five".