18009375 has 48 divisors (see below), whose sum is σ = 32060448. Its totient is φ = 8960000.

The previous prime is 18009323. The next prime is 18009401. The reversal of 18009375 is 57390081.

It is not a de Polignac number, because 18009375 - 2⁸ = 18009119 is a prime.

It is a congruent number.

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, 159319 + ... + 159431.

It is an arithmetic number, because the mean of its divisors is an integer number (667926).

Almost surely, 2^18009375 is an apocalyptic number.

18009375 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18009375 is a deficient number, since it is larger than the sum of its proper divisors (14051073).

18009375 is an equidigital number, since it uses as much as digits as its factorization.

18009375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 18009375 is about 4243.7453976411. The cubic root of 18009375 is about 262.1196305066.

It can be divided in two parts, 1800 and 9375, that added together give a triangular number (11175 = T₁₄₉).

The spelling of 18009375 in words is "eighteen million, nine thousand, three hundred seventy-five".