128127899 has 8 divisors (see below), whose sum is σ = 129565440. Its totient is φ = 126695016.

The previous prime is 128127863. The next prime is 128127907. The reversal of 128127899 is 998721821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128127899 - 2¹² = 128123803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128127599) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97682 + ... + 98984.

It is an arithmetic number, because the mean of its divisors is an integer number (16195680).

Almost surely, 2^128127899 is an apocalyptic number.

128127899 is a deficient number, since it is larger than the sum of its proper divisors (1437541).

128127899 is a wasteful number, since it uses less digits than its factorization.

128127899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2329.

The product of its digits is 145152, while the sum is 47.

The square root of 128127899 is about 11319.3594783451. The cubic root of 128127899 is about 504.1362209999.

The spelling of 128127899 in words is "one hundred twenty-eight million, one hundred twenty-seven thousand, eight hundred ninety-nine".