388138 has 4 divisors (see below), whose sum is σ = 582210. Its totient is φ = 194068.

The previous prime is 388133. The next prime is 388159. The reversal of 388138 is 831883.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 388129 + 9 = 623^2 + 3^2 .

It is a super-2 number, since 2×388138² = 301302214088, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (388133) by changing a digit.

388138 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97033 + ... + 97036.

2³⁸⁸¹³⁸ is an apocalyptic number.

388138 is a deficient number, since it is larger than the sum of its proper divisors (194072).

388138 is a wasteful number, since it uses less digits than its factorization.

388138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194071.

The product of its digits is 4608, while the sum is 31.

The square root of 388138 is about 623.0072230721. The cubic root of 388138 is about 72.9449763634.

The spelling of 388138 in words is "three hundred eighty-eight thousand, one hundred thirty-eight".