128199449 has 12 divisors (see below), whose sum is σ = 147651264. Its totient is φ = 109038384.

The previous prime is 128199433. The next prime is 128199481. The reversal of 128199449 is 944991821.

It is not a de Polignac number, because 128199449 - 2⁴ = 128199433 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128199419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 172172 + ... + 172914.

It is an arithmetic number, because the mean of its divisors is an integer number (12304272).

Almost surely, 2^128199449 is an apocalyptic number.

It is an amenable number.

128199449 is a deficient number, since it is larger than the sum of its proper divisors (19451815).

128199449 is an frugal number, since it uses more digits than its factorization.

128199449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064 (or 907 counting only the distinct ones).

The product of its digits is 186624, while the sum is 47.

The square root of 128199449 is about 11322.5195517606. The cubic root of 128199449 is about 504.2300445274.

The spelling of 128199449 in words is "one hundred twenty-eight million, one hundred ninety-nine thousand, four hundred forty-nine".