188899971 has 16 divisors (see below), whose sum is σ = 287197344. Its totient is φ = 109407744.

The previous prime is 188899969. The next prime is 188899987. The reversal of 188899971 is 179998881.

It is not a de Polignac number, because 188899971 - 2¹ = 188899969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (188899901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141796 + ... + 143121.

It is an arithmetic number, because the mean of its divisors is an integer number (17949834).

Almost surely, 2^188899971 is an apocalyptic number.

188899971 is a deficient number, since it is larger than the sum of its proper divisors (98297373).

188899971 is a wasteful number, since it uses less digits than its factorization.

188899971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284950.

The product of its digits is 2612736, while the sum is 60.

The square root of 188899971 is about 13744.0885838240. The cubic root of 188899971 is about 573.7780943235.

The spelling of 188899971 in words is "one hundred eighty-eight million, eight hundred ninety-nine thousand, nine hundred seventy-one".