388805819 has 2 divisors, whose sum is σ = 388805820. Its totient is φ = 388805818.

The previous prime is 388805789. The next prime is 388805821. The reversal of 388805819 is 918508883.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-388805819 is a prime.

It is a super-2 number, since 2×388805819² = 302339929776521522, which contains 22 as substring.

Together with 388805821, 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 (388805119) 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, 194402909 + 194402910.

It is an arithmetic number, because the mean of its divisors is an integer number (194402910).

Almost surely, 2^388805819 is an apocalyptic number.

388805819 is a deficient number, since it is larger than the sum of its proper divisors (1).

388805819 is an equidigital number, since it uses as much as digits as its factorization.

388805819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 552960, while the sum is 50.

The square root of 388805819 is about 19718.1596250766. The cubic root of 388805819 is about 729.8678806372.

The spelling of 388805819 in words is "three hundred eighty-eight million, eight hundred five thousand, eight hundred nineteen".