188305385 has 16 divisors (see below), whose sum is σ = 232921920. Its totient is φ = 146059200.

The previous prime is 188305373. The next prime is 188305391. The reversal of 188305385 is 583503881.

It is not a de Polignac number, because 188305385 - 2²⁰ = 187256809 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26735 + ... + 33035.

It is an arithmetic number, because the mean of its divisors is an integer number (14557620).

Almost surely, 2^188305385 is an apocalyptic number.

It is an amenable number.

188305385 is a deficient number, since it is larger than the sum of its proper divisors (44616535).

188305385 is a wasteful number, since it uses less digits than its factorization.

188305385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6488.

The product of its (nonzero) digits is 115200, while the sum is 41.

The square root of 188305385 is about 13722.4409271820. The cubic root of 188305385 is about 573.1754490970.

The spelling of 188305385 in words is "one hundred eighty-eight million, three hundred five thousand, three hundred eighty-five".