238638 has 16 divisors (see below), whose sum is σ = 493056. Its totient is φ = 76920.

The previous prime is 238627. The next prime is 238639. The reversal of 238638 is 836832.

238638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238639) by changing a digit.

238638 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 in 7 ways as a sum of consecutive naturals, for example, 456 + ... + 827.

It is an arithmetic number, because the mean of its divisors is an integer number (30816).

2²³⁸⁶³⁸ is an apocalyptic number.

238638 is an abundant number, since it is smaller than the sum of its proper divisors (254418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

238638 is a wasteful number, since it uses less digits than its factorization.

238638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1319.

The product of its digits is 6912, while the sum is 30.

The square root of 238638 is about 488.5058853279. The cubic root of 238638 is about 62.0268700736.

It can be divided in two parts, 23863 and 8, that added together give a triangular number (23871 = T₂₁₈).

The spelling of 238638 in words is "two hundred thirty-eight thousand, six hundred thirty-eight".