128405083 has 4 divisors (see below), whose sum is σ = 128427760. Its totient is φ = 128382408.

The previous prime is 128405077. The next prime is 128405087. The reversal of 128405083 is 380504821.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 128405083 - 2¹⁷ = 128274011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128405087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5098 + ... + 16816.

It is an arithmetic number, because the mean of its divisors is an integer number (32106940).

Almost surely, 2^128405083 is an apocalyptic number.

128405083 is a deficient number, since it is larger than the sum of its proper divisors (22677).

128405083 is a wasteful number, since it uses less digits than its factorization.

128405083 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22676.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 128405083 is about 11331.5966659602. The cubic root of 128405083 is about 504.4994982385.

The spelling of 128405083 in words is "one hundred twenty-eight million, four hundred five thousand, eighty-three".