238404809 has 2 divisors, whose sum is σ = 238404810. Its totient is φ = 238404808.

The previous prime is 238404773. The next prime is 238404811. The reversal of 238404809 is 908404832.

238404809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148913209 + 89491600 = 12203^2 + 9460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-238404809 is a prime.

Together with 238404811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (238401809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119202404 + 119202405.

It is an arithmetic number, because the mean of its divisors is an integer number (119202405).

Almost surely, 2^238404809 is an apocalyptic number.

It is an amenable number.

238404809 is a deficient number, since it is larger than the sum of its proper divisors (1).

238404809 is an equidigital number, since it uses as much as digits as its factorization.

238404809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 238404809 is about 15440.3629814846. The cubic root of 238404809 is about 620.0665979449.

The spelling of 238404809 in words is "two hundred thirty-eight million, four hundred four thousand, eight hundred nine".