128432417 has 2 divisors, whose sum is σ = 128432418. Its totient is φ = 128432416.

The previous prime is 128432401. The next prime is 128432441. The reversal of 128432417 is 714234821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88943761 + 39488656 = 9431^2 + 6284^2 .

It is a cyclic number.

It is not a de Polignac number, because 128432417 - 2⁴ = 128432401 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128432497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64216208 + 64216209.

It is an arithmetic number, because the mean of its divisors is an integer number (64216209).

Almost surely, 2^128432417 is an apocalyptic number.

It is an amenable number.

128432417 is a deficient number, since it is larger than the sum of its proper divisors (1).

128432417 is an equidigital number, since it uses as much as digits as its factorization.

128432417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 32.

The square root of 128432417 is about 11332.8026983620. The cubic root of 128432417 is about 504.5352938383.

The spelling of 128432417 in words is "one hundred twenty-eight million, four hundred thirty-two thousand, four hundred seventeen".