128388899 has 2 divisors, whose sum is σ = 128388900. Its totient is φ = 128388898.

The previous prime is 128388889. The next prime is 128388907. The reversal of 128388899 is 998883821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128388899 - 2¹² = 128384803 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128388809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64194449 + 64194450.

It is an arithmetic number, because the mean of its divisors is an integer number (64194450).

Almost surely, 2^128388899 is an apocalyptic number.

128388899 is a deficient number, since it is larger than the sum of its proper divisors (1).

128388899 is an equidigital number, since it uses as much as digits as its factorization.

128388899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1990656, while the sum is 56.

The square root of 128388899 is about 11330.8825340306. The cubic root of 128388899 is about 504.4783018737.

The spelling of 128388899 in words is "one hundred twenty-eight million, three hundred eighty-eight thousand, eight hundred ninety-nine".