128360399 has 4 divisors (see below), whose sum is σ = 128911536. Its totient is φ = 127809264.

The previous prime is 128360389. The next prime is 128360411. The reversal of 128360399 is 993063821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128360399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128360359) 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 in 3 ways as a sum of consecutive naturals, for example, 275219 + ... + 275684.

It is an arithmetic number, because the mean of its divisors is an integer number (32227884).

Almost surely, 2^128360399 is an apocalyptic number.

128360399 is a deficient number, since it is larger than the sum of its proper divisors (551137).

128360399 is an equidigital number, since it uses as much as digits as its factorization.

128360399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551136.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 128360399 is about 11329.6248393316. The cubic root of 128360399 is about 504.4409707761.

The spelling of 128360399 in words is "one hundred twenty-eight million, three hundred sixty thousand, three hundred ninety-nine".