188138 has 8 divisors (see below), whose sum is σ = 297120. Its totient is φ = 89100.

The previous prime is 188137. The next prime is 188143. The reversal of 188138 is 831881.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 188138.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 188138.

It is not an unprimeable number, because it can be changed into a prime (188137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2438 + ... + 2513.

It is an arithmetic number, because the mean of its divisors is an integer number (37140).

2¹⁸⁸¹³⁸ is an apocalyptic number.

188138 is a deficient number, since it is larger than the sum of its proper divisors (108982).

188138 is a wasteful number, since it uses less digits than its factorization.

188138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4972.

The product of its digits is 1536, while the sum is 29.

The square root of 188138 is about 433.7487752144. The cubic root of 188138 is about 57.3005566517.

The spelling of 188138 in words is "one hundred eighty-eight thousand, one hundred thirty-eight".