128138305 has 16 divisors (see below), whose sum is σ = 156873024. Its totient is φ = 100459840.

The previous prime is 128138303. The next prime is 128138317. The reversal of 128138305 is 503831821.

It is not a de Polignac number, because 128138305 - 2¹ = 128138303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128138303) 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 15 ways as a sum of consecutive naturals, for example, 53187 + ... + 55543.

It is an arithmetic number, because the mean of its divisors is an integer number (9804564).

Almost surely, 2^128138305 is an apocalyptic number.

It is an amenable number.

128138305 is a deficient number, since it is larger than the sum of its proper divisors (28734719).

128138305 is a wasteful number, since it uses less digits than its factorization.

128138305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2576.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 128138305 is about 11319.8191239966. The cubic root of 128138305 is about 504.1498685598.

The spelling of 128138305 in words is "one hundred twenty-eight million, one hundred thirty-eight thousand, three hundred five".