128458439 has 2 divisors, whose sum is σ = 128458440. Its totient is φ = 128458438.

The previous prime is 128458433. The next prime is 128458471. The reversal of 128458439 is 934854821.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (934854821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128458439 - 2⁴ = 128458423 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128458439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128458433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64229219 + 64229220.

It is an arithmetic number, because the mean of its divisors is an integer number (64229220).

Almost surely, 2^128458439 is an apocalyptic number.

128458439 is a deficient number, since it is larger than the sum of its proper divisors (1).

128458439 is an equidigital number, since it uses as much as digits as its factorization.

128458439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 44.

The square root of 128458439 is about 11333.9507233797. The cubic root of 128458439 is about 504.5693665725.

The spelling of 128458439 in words is "one hundred twenty-eight million, four hundred fifty-eight thousand, four hundred thirty-nine".