238231685 has 16 divisors (see below), whose sum is σ = 289307376. Its totient is φ = 188310528.

The previous prime is 238231681. The next prime is 238231711. The reversal of 238231685 is 586132832.

It can be written as a sum of positive squares in 8 ways, for example, as 71537764 + 166693921 = 8458^2 + 12911^2 .

It is a cyclic number.

It is not a de Polignac number, because 238231685 - 2² = 238231681 is a prime.

It is a Duffinian 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 (238231681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 314327 + ... + 315083.

It is an arithmetic number, because the mean of its divisors is an integer number (18081711).

Almost surely, 2^238231685 is an apocalyptic number.

It is an amenable number.

238231685 is a deficient number, since it is larger than the sum of its proper divisors (51075691).

238231685 is a wasteful number, since it uses less digits than its factorization.

238231685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1432.

The product of its digits is 69120, while the sum is 38.

The square root of 238231685 is about 15434.7557479864. The cubic root of 238231685 is about 619.9164689755.

The spelling of 238231685 in words is "two hundred thirty-eight million, two hundred thirty-one thousand, six hundred eighty-five".