238728791 has 8 divisors (see below), whose sum is σ = 273302400. Its totient is φ = 204272568.

The previous prime is 238728769. The next prime is 238728797. The reversal of 238728791 is 197827832.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 238728791 - 2¹⁸ = 238466647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238728797) 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 7 ways as a sum of consecutive naturals, for example, 24941 + ... + 33158.

It is an arithmetic number, because the mean of its divisors is an integer number (34162800).

Almost surely, 2^238728791 is an apocalyptic number.

238728791 is a deficient number, since it is larger than the sum of its proper divisors (34573609).

238728791 is an equidigital number, since it uses as much as digits as its factorization.

238728791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58693.

The product of its digits is 338688, while the sum is 47.

The square root of 238728791 is about 15450.8508179970. The cubic root of 238728791 is about 620.3473521874.

The spelling of 238728791 in words is "two hundred thirty-eight million, seven hundred twenty-eight thousand, seven hundred ninety-one".