128575039 has 4 divisors (see below), whose sum is σ = 128752624. Its totient is φ = 128397456.

The previous prime is 128575021. The next prime is 128575043. The reversal of 128575039 is 930575821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 930575821 = 7 ⋅132939403.

It is a cyclic number.

It is not a de Polignac number, because 128575039 - 2⁹ = 128574527 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128574992 and 128575010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128575019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87702 + ... + 89155.

It is an arithmetic number, because the mean of its divisors is an integer number (32188156).

Almost surely, 2^128575039 is an apocalyptic number.

128575039 is a deficient number, since it is larger than the sum of its proper divisors (177585).

128575039 is an equidigital number, since it uses as much as digits as its factorization.

128575039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177584.

The product of its (nonzero) digits is 75600, while the sum is 40.

The square root of 128575039 is about 11339.0933940946. The cubic root of 128575039 is about 504.7219840183.

The spelling of 128575039 in words is "one hundred twenty-eight million, five hundred seventy-five thousand, thirty-nine".