238878389 has 2 divisors, whose sum is σ = 238878390. Its totient is φ = 238878388.

The previous prime is 238878361. The next prime is 238878413. The reversal of 238878389 is 983878832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235868164 + 3010225 = 15358^2 + 1735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-238878389 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238878329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119439194 + 119439195.

It is an arithmetic number, because the mean of its divisors is an integer number (119439195).

Almost surely, 2^238878389 is an apocalyptic number.

It is an amenable number.

238878389 is a deficient number, since it is larger than the sum of its proper divisors (1).

238878389 is an equidigital number, since it uses as much as digits as its factorization.

238878389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4644864, while the sum is 56.

The square root of 238878389 is about 15455.6911524525. The cubic root of 238878389 is about 620.4769041430.

The spelling of 238878389 in words is "two hundred thirty-eight million, eight hundred seventy-eight thousand, three hundred eighty-nine".