238437813 has 4 divisors (see below), whose sum is σ = 317917088. Its totient is φ = 158958540.

The previous prime is 238437811. The next prime is 238437817. The reversal of 238437813 is 318734832.

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 not a de Polignac number, because 238437813 - 2¹ = 238437811 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 (238437811) 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, 39739633 + ... + 39739638.

It is an arithmetic number, because the mean of its divisors is an integer number (79479272).

Almost surely, 2^238437813 is an apocalyptic number.

It is an amenable number.

238437813 is a deficient number, since it is larger than the sum of its proper divisors (79479275).

238437813 is an equidigital number, since it uses as much as digits as its factorization.

238437813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79479274.

The product of its digits is 96768, while the sum is 39.

The square root of 238437813 is about 15441.4317017562. The cubic root of 238437813 is about 620.0952099708.

The spelling of 238437813 in words is "two hundred thirty-eight million, four hundred thirty-seven thousand, eight hundred thirteen".