18321875 has 48 divisors (see below), whose sum is σ = 27560736. Its totient is φ = 12000000.

The previous prime is 18321857. The next prime is 18321883. The reversal of 18321875 is 57812381.

It is not a de Polignac number, because 18321875 - 2¹⁰ = 18320851 is a prime.

It is a super-2 number, since 2×18321875² = 671382207031250, which contains 22 as substring.

It is a Duffinian number.

Its product of digits (13440) is a multiple of the sum of its prime divisors (70).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 446855 + ... + 446895.

It is an arithmetic number, because the mean of its divisors is an integer number (574182).

Almost surely, 2^18321875 is an apocalyptic number.

18321875 is a deficient number, since it is larger than the sum of its proper divisors (9238861).

18321875 is an equidigital number, since it uses as much as digits as its factorization.

18321875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90 (or 70 counting only the distinct ones).

The product of its digits is 13440, while the sum is 35.

The square root of 18321875 is about 4280.4059386932. The cubic root of 18321875 is about 263.6270512511.

The spelling of 18321875 in words is "eighteen million, three hundred twenty-one thousand, eight hundred seventy-five".