188438107 has 16 divisors (see below), whose sum is σ = 222068448. Its totient is φ = 157639680.

The previous prime is 188438071. The next prime is 188438111. The reversal of 188438107 is 701834881.

It is not a de Polignac number, because 188438107 - 2²⁷ = 54220379 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 188438107.

It is not an unprimeable number, because it can be changed into a prime (188438167) by changing a digit.

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, 48613 + ... + 52345.

It is an arithmetic number, because the mean of its divisors is an integer number (13879278).

Almost surely, 2^188438107 is an apocalyptic number.

188438107 is a deficient number, since it is larger than the sum of its proper divisors (33630341).

188438107 is a wasteful number, since it uses less digits than its factorization.

188438107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4110.

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 188438107 is about 13727.2760225764. The cubic root of 188438107 is about 573.3100799189.

The spelling of 188438107 in words is "one hundred eighty-eight million, four hundred thirty-eight thousand, one hundred seven".