128016439 has 2 divisors, whose sum is σ = 128016440. Its totient is φ = 128016438.

The previous prime is 128016403. The next prime is 128016503. The reversal of 128016439 is 934610821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128016439 - 2⁷ = 128016311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128016839) 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, 64008219 + 64008220.

It is an arithmetic number, because the mean of its divisors is an integer number (64008220).

Almost surely, 2^128016439 is an apocalyptic number.

128016439 is a deficient number, since it is larger than the sum of its proper divisors (1).

128016439 is an equidigital number, since it uses as much as digits as its factorization.

128016439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 128016439 is about 11314.4349836835. The cubic root of 128016439 is about 503.9899938700.

The spelling of 128016439 in words is "one hundred twenty-eight million, sixteen thousand, four hundred thirty-nine".