128049427 has 4 divisors (see below), whose sum is σ = 139690296. Its totient is φ = 116408560.

The previous prime is 128049403. The next prime is 128049443. The reversal of 128049427 is 724940821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128049427 - 2¹¹ = 128047379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128049527) 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 3 ways as a sum of consecutive naturals, for example, 5820418 + ... + 5820439.

It is an arithmetic number, because the mean of its divisors is an integer number (34922574).

Almost surely, 2^128049427 is an apocalyptic number.

128049427 is a deficient number, since it is larger than the sum of its proper divisors (11640869).

128049427 is a wasteful number, since it uses less digits than its factorization.

128049427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11640868.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 128049427 is about 11315.8926735808. The cubic root of 128049427 is about 504.0332804827.

The spelling of 128049427 in words is "one hundred twenty-eight million, forty-nine thousand, four hundred twenty-seven".