238718813 has 4 divisors (see below), whose sum is σ = 238971840. Its totient is φ = 238465788.

The previous prime is 238718791. The next prime is 238718839. The reversal of 238718813 is 318817832.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 238718813 - 2¹⁰ = 238717789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238738813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125093 + ... + 126986.

It is an arithmetic number, because the mean of its divisors is an integer number (59742960).

Almost surely, 2^238718813 is an apocalyptic number.

It is an amenable number.

238718813 is a deficient number, since it is larger than the sum of its proper divisors (253027).

238718813 is an equidigital number, since it uses as much as digits as its factorization.

238718813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253026.

The product of its digits is 64512, while the sum is 41.

The square root of 238718813 is about 15450.5279197832. The cubic root of 238718813 is about 620.3387093085.

The spelling of 238718813 in words is "two hundred thirty-eight million, seven hundred eighteen thousand, eight hundred thirteen".