128390719 has 2 divisors, whose sum is σ = 128390720. Its totient is φ = 128390718.

The previous prime is 128390711. The next prime is 128390729. The reversal of 128390719 is 917093821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128390719 - 2³ = 128390711 is a prime.

It is a super-2 number, since 2×128390719² = 32968353450673922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128390711) 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, 64195359 + 64195360.

It is an arithmetic number, because the mean of its divisors is an integer number (64195360).

Almost surely, 2^128390719 is an apocalyptic number.

128390719 is a deficient number, since it is larger than the sum of its proper divisors (1).

128390719 is an equidigital number, since it uses as much as digits as its factorization.

128390719 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 128390719 is about 11330.9628452308. The cubic root of 128390719 is about 504.4806856369.

The spelling of 128390719 in words is "one hundred twenty-eight million, three hundred ninety thousand, seven hundred nineteen".