238817993 has 4 divisors (see below), whose sum is σ = 249201408. Its totient is φ = 228434580.

The previous prime is 238817911. The next prime is 238818031. The reversal of 238817993 is 399718832.

It is a happy number.

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 238817993 - 2⁸ = 238817737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (238817903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5191673 + ... + 5191718.

It is an arithmetic number, because the mean of its divisors is an integer number (62300352).

Almost surely, 2^238817993 is an apocalyptic number.

238817993 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

238817993 is a deficient number, since it is larger than the sum of its proper divisors (10383415).

238817993 is a wasteful number, since it uses less digits than its factorization.

238817993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10383414.

The product of its digits is 653184, while the sum is 50.

The square root of 238817993 is about 15453.7371855484. The cubic root of 238817993 is about 620.4246076838.

The spelling of 238817993 in words is "two hundred thirty-eight million, eight hundred seventeen thousand, nine hundred ninety-three".