128346899 has 2 divisors, whose sum is σ = 128346900. Its totient is φ = 128346898.

The previous prime is 128346871. The next prime is 128346931. The reversal of 128346899 is 998643821.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128346899 - 2¹² = 128342803 is a prime.

It is not a weakly prime, because it can be changed into another prime (128346809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64173449 + 64173450.

It is an arithmetic number, because the mean of its divisors is an integer number (64173450).

Almost surely, 2^128346899 is an apocalyptic number.

128346899 is a deficient number, since it is larger than the sum of its proper divisors (1).

128346899 is an equidigital number, since it uses as much as digits as its factorization.

128346899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 50.

The square root of 128346899 is about 11329.0290404783. The cubic root of 128346899 is about 504.4232856958.

The spelling of 128346899 in words is "one hundred twenty-eight million, three hundred forty-six thousand, eight hundred ninety-nine".