839808019 has 2 divisors, whose sum is σ = 839808020. Its totient is φ = 839808018.

The previous prime is 839807989. The next prime is 839808023. The reversal of 839808019 is 910808938.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-839808019 is a prime.

It is a super-2 number, since 2×839808019² = 1410555017553408722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 839808019.

It is not a weakly prime, because it can be changed into another prime (839808029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419904009 + 419904010.

It is an arithmetic number, because the mean of its divisors is an integer number (419904010).

Almost surely, 2^839808019 is an apocalyptic number.

839808019 is a deficient number, since it is larger than the sum of its proper divisors (1).

839808019 is an equidigital number, since it uses as much as digits as its factorization.

839808019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 839808019 is about 28979.4413162159. The cubic root of 839808019 is about 943.4669090303.

The spelling of 839808019 in words is "eight hundred thirty-nine million, eight hundred eight thousand, nineteen".