128699199 has 10 divisors (see below), whose sum is σ = 192254480. Its totient is φ = 85799412.

The previous prime is 128699183. The next prime is 128699201. The reversal of 128699199 is 991996821.

It is not a de Polignac number, because 128699199 - 2⁴ = 128699183 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 (128699399) 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 9 ways as a sum of consecutive naturals, for example, 794359 + ... + 794520.

It is an arithmetic number, because the mean of its divisors is an integer number (19225448).

Almost surely, 2^128699199 is an apocalyptic number.

128699199 is a deficient number, since it is larger than the sum of its proper divisors (63555281).

128699199 is an equidigital number, since it uses as much as digits as its factorization.

128699199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588891 (or 1588882 counting only the distinct ones).

The product of its digits is 629856, while the sum is 54.

The square root of 128699199 is about 11344.5669375256. The cubic root of 128699199 is about 504.8843953265.

The spelling of 128699199 in words is "one hundred twenty-eight million, six hundred ninety-nine thousand, one hundred ninety-nine".