188868385 has 8 divisors (see below), whose sum is σ = 239974056. Its totient is φ = 142206720.

The previous prime is 188868373. The next prime is 188868391. The reversal of 188868385 is 583868881.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 62710561 + 126157824 = 7919^2 + 11232^2 .

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

It is not a de Polignac number, because 188868385 - 2⁵ = 188868353 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 1110906 + ... + 1111075.

It is an arithmetic number, because the mean of its divisors is an integer number (29996757).

Almost surely, 2^188868385 is an apocalyptic number.

It is an amenable number.

188868385 is a deficient number, since it is larger than the sum of its proper divisors (51105671).

188868385 is a wasteful number, since it uses less digits than its factorization.

188868385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222003.

The product of its digits is 2949120, while the sum is 55.

The square root of 188868385 is about 13742.9394599554. The cubic root of 188868385 is about 573.7461120262.

The spelling of 188868385 in words is "one hundred eighty-eight million, eight hundred sixty-eight thousand, three hundred eighty-five".