18128875 has 8 divisors (see below), whose sum is σ = 22624992. Its totient is φ = 14503000.

The previous prime is 18128863. The next prime is 18128879. The reversal of 18128875 is 57882181.

It is not a de Polignac number, because 18128875 - 2²¹ = 16031723 is a prime.

It is a super-2 number, since 2×18128875² = 657312217531250, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18128879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72391 + ... + 72640.

It is an arithmetic number, because the mean of its divisors is an integer number (2828124).

Almost surely, 2^18128875 is an apocalyptic number.

18128875 is a deficient number, since it is larger than the sum of its proper divisors (4496117).

18128875 is an equidigital number, since it uses as much as digits as its factorization.

18128875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145046 (or 145036 counting only the distinct ones).

The product of its digits is 35840, while the sum is 40.

The square root of 18128875 is about 4257.8016628302. The cubic root of 18128875 is about 262.6981119717.

The spelling of 18128875 in words is "eighteen million, one hundred twenty-eight thousand, eight hundred seventy-five".