188042939 has 12 divisors (see below), whose sum is σ = 221004504. Its totient is φ = 159513984.

The previous prime is 188042927. The next prime is 188042947. The reversal of 188042939 is 939240881.

It is a happy number.

It is not a de Polignac number, because 188042939 - 2⁴ = 188042923 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 188042939.

It is not an unprimeable number, because it can be changed into a prime (188042909) 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 11 ways as a sum of consecutive naturals, for example, 15029 + ... + 24534.

It is an arithmetic number, because the mean of its divisors is an integer number (18417042).

Almost surely, 2^188042939 is an apocalyptic number.

188042939 is a deficient number, since it is larger than the sum of its proper divisors (32961565).

188042939 is an equidigital number, since it uses as much as digits as its factorization.

188042939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39674 (or 39667 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 188042939 is about 13712.8749356216. The cubic root of 188042939 is about 572.9090422299.

The spelling of 188042939 in words is "one hundred eighty-eight million, forty-two thousand, nine hundred thirty-nine".