238591387 has 2 divisors, whose sum is σ = 238591388. Its totient is φ = 238591386.

The previous prime is 238591349. The next prime is 238591399. The reversal of 238591387 is 783195832.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-238591387 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (238591307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119295693 + 119295694.

It is an arithmetic number, because the mean of its divisors is an integer number (119295694).

Almost surely, 2^238591387 is an apocalyptic number.

238591387 is a deficient number, since it is larger than the sum of its proper divisors (1).

238591387 is an equidigital number, since it uses as much as digits as its factorization.

238591387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 46.

The square root of 238591387 is about 15446.4036914746. The cubic root of 238591387 is about 620.2283125499.

The spelling of 238591387 in words is "two hundred thirty-eight million, five hundred ninety-one thousand, three hundred eighty-seven".