188288138 has 8 divisors (see below), whose sum is σ = 297297120. Its totient is φ = 89189100.

The previous prime is 188288137. The next prime is 188288147. The reversal of 188288138 is 831882881.

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

It is a junction number, because it is equal to n+sod(n) for n = 188288092 and 188288101.

It is not an unprimeable number, because it can be changed into a prime (188288137) 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, 2477438 + ... + 2477513.

It is an arithmetic number, because the mean of its divisors is an integer number (37162140).

Almost surely, 2^188288138 is an apocalyptic number.

188288138 is a deficient number, since it is larger than the sum of its proper divisors (109008982).

188288138 is a wasteful number, since it uses less digits than its factorization.

188288138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4954972.

The product of its digits is 196608, while the sum is 47.

The square root of 188288138 is about 13721.8124896094. The cubic root of 188288138 is about 573.1579494048.

The spelling of 188288138 in words is "one hundred eighty-eight million, two hundred eighty-eight thousand, one hundred thirty-eight".