388230809 has 2 divisors, whose sum is σ = 388230810. Its totient is φ = 388230808.

The previous prime is 388230721. The next prime is 388230827. The reversal of 388230809 is 908032883.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 386987584 + 1243225 = 19672^2 + 1115^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-388230809 is a prime.

It is a super-2 number, since 2×388230809² = 301446322113588962, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (388230839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194115404 + 194115405.

It is an arithmetic number, because the mean of its divisors is an integer number (194115405).

Almost surely, 2^388230809 is an apocalyptic number.

It is an amenable number.

388230809 is a deficient number, since it is larger than the sum of its proper divisors (1).

388230809 is an equidigital number, since it uses as much as digits as its factorization.

388230809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 388230809 is about 19703.5735083766. The cubic root of 388230809 is about 729.5078994072.

The spelling of 388230809 in words is "three hundred eighty-eight million, two hundred thirty thousand, eight hundred nine".