128239087 has 4 divisors (see below), whose sum is σ = 128553040. Its totient is φ = 127925136.

The previous prime is 128239079. The next prime is 128239091. The reversal of 128239087 is 780932821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 780932821 = 20759 ⋅37619.

It is a cyclic number.

It is not a de Polignac number, because 128239087 - 2³ = 128239079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128239187) 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, 156363 + ... + 157180.

It is an arithmetic number, because the mean of its divisors is an integer number (32138260).

Almost surely, 2^128239087 is an apocalyptic number.

128239087 is a deficient number, since it is larger than the sum of its proper divisors (313953).

128239087 is an equidigital number, since it uses as much as digits as its factorization.

128239087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313952.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 128239087 is about 11324.2698219355. The cubic root of 128239087 is about 504.2820068178.

The spelling of 128239087 in words is "one hundred twenty-eight million, two hundred thirty-nine thousand, eighty-seven".