18221875 has 48 divisors (see below), whose sum is σ = 28123200. Its totient is φ = 11760000.

The previous prime is 18221869. The next prime is 18221887. The reversal of 18221875 is 57812281.

It is not a de Polignac number, because 18221875 - 2¹¹ = 18219827 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18221875.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 1071867 + ... + 1071883.

It is an arithmetic number, because the mean of its divisors is an integer number (585900).

Almost surely, 2^18221875 is an apocalyptic number.

18221875 is a deficient number, since it is larger than the sum of its proper divisors (9901325).

18221875 is an frugal number, since it uses more digits than its factorization.

18221875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63 (or 29 counting only the distinct ones).

The product of its digits is 8960, while the sum is 34.

The square root of 18221875 is about 4268.7088211777. The cubic root of 18221875 is about 263.1465543359.

The spelling of 18221875 in words is "eighteen million, two hundred twenty-one thousand, eight hundred seventy-five".