238686313 has 4 divisors (see below), whose sum is σ = 238914900. Its totient is φ = 238457728.

The previous prime is 238686299. The next prime is 238686367. The reversal of 238686313 is 313686832.

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 227315929 + 11370384 = 15077^2 + 3372^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-238686313 is a prime.

It is a Smith number, since the sum of its digits (40) 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 not an unprimeable number, because it can be changed into a prime (238686913) 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, 112720 + ... + 114817.

It is an arithmetic number, because the mean of its divisors is an integer number (59728725).

Almost surely, 2^238686313 is an apocalyptic number.

It is an amenable number.

238686313 is a deficient number, since it is larger than the sum of its proper divisors (228587).

238686313 is a wasteful number, since it uses less digits than its factorization.

238686313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228586.

The product of its digits is 124416, while the sum is 40.

The square root of 238686313 is about 15449.4761399861. The cubic root of 238686313 is about 620.3105563492.

The spelling of 238686313 in words is "two hundred thirty-eight million, six hundred eighty-six thousand, three hundred thirteen".