18228386 has 48 divisors (see below), whose sum is σ = 32890752. Its totient is φ = 7507200.

The previous prime is 18228367. The next prime is 18228389. The reversal of 18228386 is 68382281.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

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 23 ways as a sum of consecutive naturals, for example, 298796 + ... + 298856.

It is an arithmetic number, because the mean of its divisors is an integer number (685224).

Almost surely, 2^18228386 is an apocalyptic number.

18228386 is a deficient number, since it is larger than the sum of its proper divisors (14662366).

18228386 is a wasteful number, since it uses less digits than its factorization.

18228386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155 (or 138 counting only the distinct ones).

The product of its digits is 36864, while the sum is 38.

The square root of 18228386 is about 4269.4713958522. The cubic root of 18228386 is about 263.1778929181.

The spelling of 18228386 in words is "eighteen million, two hundred twenty-eight thousand, three hundred eighty-six".