128415439 has 2 divisors, whose sum is σ = 128415440. Its totient is φ = 128415438.

The previous prime is 128415409. The next prime is 128415457. The reversal of 128415439 is 934514821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128415439 - 2⁷ = 128415311 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128415398 and 128415407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128415409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64207719 + 64207720.

It is an arithmetic number, because the mean of its divisors is an integer number (64207720).

Almost surely, 2^128415439 is an apocalyptic number.

128415439 is a deficient number, since it is larger than the sum of its proper divisors (1).

128415439 is an equidigital number, since it uses as much as digits as its factorization.

128415439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 37.

The square root of 128415439 is about 11332.0536091213. The cubic root of 128415439 is about 504.5130606724.

The spelling of 128415439 in words is "one hundred twenty-eight million, four hundred fifteen thousand, four hundred thirty-nine".