238638889 has 2 divisors, whose sum is σ = 238638890. Its totient is φ = 238638888.

The previous prime is 238638817. The next prime is 238638919. The reversal of 238638889 is 988836832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235776025 + 2862864 = 15355^2 + 1692^2 .

It is a cyclic number.

It is not a de Polignac number, because 238638889 - 2⁷ = 238638761 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (238638289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119319444 + 119319445.

It is an arithmetic number, because the mean of its divisors is an integer number (119319445).

Almost surely, 2^238638889 is an apocalyptic number.

It is an amenable number.

238638889 is a deficient number, since it is larger than the sum of its proper divisors (1).

238638889 is an equidigital number, since it uses as much as digits as its factorization.

238638889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3981312, while the sum is 55.

The square root of 238638889 is about 15447.9412544196. The cubic root of 238638889 is about 620.2694709654.

The spelling of 238638889 in words is "two hundred thirty-eight million, six hundred thirty-eight thousand, eight hundred eighty-nine".