238638865 has 4 divisors (see below), whose sum is σ = 286366644. Its totient is φ = 190911088.

The previous prime is 238638817. The next prime is 238638889. The reversal of 238638865 is 568836832.

238638865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 61402896 + 177235969 = 7836^2 + 13313^2 .

It is a cyclic number.

It is not a de Polignac number, because 238638865 - 2¹¹ = 238636817 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23863882 + ... + 23863891.

It is an arithmetic number, because the mean of its divisors is an integer number (71591661).

Almost surely, 2^238638865 is an apocalyptic number.

It is an amenable number.

238638865 is a deficient number, since it is larger than the sum of its proper divisors (47727779).

238638865 is an equidigital number, since it uses as much as digits as its factorization.

238638865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47727778.

The product of its digits is 1658880, while the sum is 49.

The square root of 238638865 is about 15447.9404776171. The cubic root of 238638865 is about 620.2694501718.

The spelling of 238638865 in words is "two hundred thirty-eight million, six hundred thirty-eight thousand, eight hundred sixty-five".