238657387 has 2 divisors, whose sum is σ = 238657388. Its totient is φ = 238657386.

The previous prime is 238657343. The next prime is 238657409. The reversal of 238657387 is 783756832.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-238657387 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 238657387.

It is not a weakly prime, because it can be changed into another prime (238657337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119328693 + 119328694.

It is an arithmetic number, because the mean of its divisors is an integer number (119328694).

Almost surely, 2^238657387 is an apocalyptic number.

238657387 is a deficient number, since it is larger than the sum of its proper divisors (1).

238657387 is an equidigital number, since it uses as much as digits as its factorization.

238657387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 49.

The square root of 238657387 is about 15448.5399633752. The cubic root of 238657387 is about 620.2854971997.

The spelling of 238657387 in words is "two hundred thirty-eight million, six hundred fifty-seven thousand, three hundred eighty-seven".