128005873 has 2 divisors, whose sum is σ = 128005874. Its totient is φ = 128005872.

The previous prime is 128005853. The next prime is 128005921. The reversal of 128005873 is 378500821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127983969 + 21904 = 11313^2 + 148^2 .

It is an emirp because it is prime and its reverse (378500821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128005873 - 2¹⁷ = 127874801 is a prime.

It is not a weakly prime, because it can be changed into another prime (128005853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64002936 + 64002937.

It is an arithmetic number, because the mean of its divisors is an integer number (64002937).

Almost surely, 2^128005873 is an apocalyptic number.

It is an amenable number.

128005873 is a deficient number, since it is larger than the sum of its proper divisors (1).

128005873 is an equidigital number, since it uses as much as digits as its factorization.

128005873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 128005873 is about 11313.9680483904. The cubic root of 128005873 is about 503.9761276696.

The spelling of 128005873 in words is "one hundred twenty-eight million, five thousand, eight hundred seventy-three".