238831 has 4 divisors (see below), whose sum is σ = 240064. Its totient is φ = 237600.

The previous prime is 238829. The next prime is 238837. The reversal of 238831 is 138832.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 238831 - 2¹ = 238829 is a prime.

It is a super-2 number, since 2×238831² = 114080493122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 238796 and 238805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238837) 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, 255 + ... + 736.

It is an arithmetic number, because the mean of its divisors is an integer number (60016).

2²³⁸⁸³¹ is an apocalyptic number.

238831 is a deficient number, since it is larger than the sum of its proper divisors (1233).

238831 is an equidigital number, since it uses as much as digits as its factorization.

238831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232.

The product of its digits is 1152, while the sum is 25.

The square root of 238831 is about 488.7033865240. The cubic root of 238831 is about 62.0435871096.

Subtracting from 238831 its reverse (138832), we obtain a palindrome (99999).

The spelling of 238831 in words is "two hundred thirty-eight thousand, eight hundred thirty-one".