188139 has 24 divisors (see below), whose sum is σ = 314368. Its totient is φ = 97920.

The previous prime is 188137. The next prime is 188143. The reversal of 188139 is 931881.

It is not a de Polignac number, because 188139 - 2¹ = 188137 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 188139.

It is not an unprimeable number, because it can be changed into a prime (188137) 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 23 ways as a sum of consecutive naturals, for example, 6054 + ... + 6084.

2¹⁸⁸¹³⁹ is an apocalyptic number.

188139 is a deficient number, since it is larger than the sum of its proper divisors (126229).

188139 is a wasteful number, since it uses less digits than its factorization.

188139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75 (or 58 counting only the distinct ones).

The product of its digits is 1728, while the sum is 30.

The square root of 188139 is about 433.7499279539. The cubic root of 188139 is about 57.3006581737.

The spelling of 188139 in words is "one hundred eighty-eight thousand, one hundred thirty-nine".