238128647 has 2 divisors, whose sum is σ = 238128648. Its totient is φ = 238128646.

The previous prime is 238128641. The next prime is 238128713. The reversal of 238128647 is 746821832.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-238128647 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238128641) 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 as a sum of consecutive naturals, namely, 119064323 + 119064324.

It is an arithmetic number, because the mean of its divisors is an integer number (119064324).

Almost surely, 2^238128647 is an apocalyptic number.

238128647 is a deficient number, since it is larger than the sum of its proper divisors (1).

238128647 is an equidigital number, since it uses as much as digits as its factorization.

238128647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 41.

The square root of 238128647 is about 15431.4175304798. The cubic root of 238128647 is about 619.8270823710.

The spelling of 238128647 in words is "two hundred thirty-eight million, one hundred twenty-eight thousand, six hundred forty-seven".