18003385 has 8 divisors (see below), whose sum is σ = 21679560. Its totient is φ = 14352384.

The previous prime is 18003379. The next prime is 18003407. The reversal of 18003385 is 58330081.

It can be written as a sum of positive squares in 4 ways, for example, as 8590761 + 9412624 = 2931^2 + 3068^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18003385 - 2¹³ = 17995193 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 4680 + ... + 7609.

It is an arithmetic number, because the mean of its divisors is an integer number (2709945).

Almost surely, 2^18003385 is an apocalyptic number.

It is an amenable number.

18003385 is a deficient number, since it is larger than the sum of its proper divisors (3676175).

18003385 is a wasteful number, since it uses less digits than its factorization.

18003385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12587.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 18003385 is about 4243.0395944417. The cubic root of 18003385 is about 262.0905665572.

The spelling of 18003385 in words is "eighteen million, three thousand, three hundred eighty-five".