188990065 has 32 divisors (see below), whose sum is σ = 253783296. Its totient is φ = 133954560.

The previous prime is 188990051. The next prime is 188990069. The reversal of 188990065 is 560099881.

It is not a de Polignac number, because 188990065 - 2⁹ = 188989553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 188989997 and 188990024.

It is not an unprimeable number, because it can be changed into a prime (188990069) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 413317 + ... + 413773.

It is an arithmetic number, because the mean of its divisors is an integer number (7930728).

Almost surely, 2^188990065 is an apocalyptic number.

It is an amenable number.

188990065 is a deficient number, since it is larger than the sum of its proper divisors (64793231).

188990065 is a wasteful number, since it uses less digits than its factorization.

188990065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649.

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 188990065 is about 13747.3657476623. The cubic root of 188990065 is about 573.8692991151.

The spelling of 188990065 in words is "one hundred eighty-eight million, nine hundred ninety thousand, sixty-five".