188639649 has 24 divisors (see below), whose sum is σ = 298007424. Its totient is φ = 114036000.

The previous prime is 188639641. The next prime is 188639663. The reversal of 188639649 is 946936881.

It is not a de Polignac number, because 188639649 - 2³ = 188639641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 188639595 and 188639604.

It is not an unprimeable number, because it can be changed into a prime (188639641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40459 + ... + 44879.

It is an arithmetic number, because the mean of its divisors is an integer number (12416976).

Almost surely, 2^188639649 is an apocalyptic number.

It is an amenable number.

188639649 is a deficient number, since it is larger than the sum of its proper divisors (109367775).

188639649 is a wasteful number, since it uses less digits than its factorization.

188639649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4869 (or 4866 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The square root of 188639649 is about 13734.6149927837. The cubic root of 188639649 is about 573.5143996869.

The spelling of 188639649 in words is "one hundred eighty-eight million, six hundred thirty-nine thousand, six hundred forty-nine".