18228849 has 16 divisors (see below), whose sum is σ = 25297920. Its totient is φ = 11661440.

The previous prime is 18228829. The next prime is 18228863. The reversal of 18228849 is 94882281.

It is a cyclic number.

It is not a de Polignac number, because 18228849 - 2⁸ = 18228593 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18228849.

It is not an unprimeable number, because it can be changed into a prime (18228829) 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 15 ways as a sum of consecutive naturals, for example, 16069 + ... + 17165.

It is an arithmetic number, because the mean of its divisors is an integer number (1581120).

Almost surely, 2^18228849 is an apocalyptic number.

It is an amenable number.

18228849 is a deficient number, since it is larger than the sum of its proper divisors (7069071).

18228849 is a wasteful number, since it uses less digits than its factorization.

18228849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1320.

The product of its digits is 73728, while the sum is 42.

The square root of 18228849 is about 4269.5256176770. The cubic root of 18228849 is about 263.1801211339.

The spelling of 18228849 in words is "eighteen million, two hundred twenty-eight thousand, eight hundred forty-nine".