188139388 has 12 divisors (see below), whose sum is σ = 332441200. Its totient is φ = 93156192.

The previous prime is 188139373. The next prime is 188139389. The reversal of 188139388 is 883931881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188139389) 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 3 ways as a sum of consecutive naturals, for example, 227913 + ... + 228736.

Almost surely, 2^188139388 is an apocalyptic number.

It is an amenable number.

188139388 is a deficient number, since it is larger than the sum of its proper divisors (144301812).

188139388 is a wasteful number, since it uses less digits than its factorization.

188139388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456756 (or 456754 counting only the distinct ones).

The product of its digits is 331776, while the sum is 49.

The square root of 188139388 is about 13716.3912163513. The cubic root of 188139388 is about 573.0069756417.

The spelling of 188139388 in words is "one hundred eighty-eight million, one hundred thirty-nine thousand, three hundred eighty-eight".