128125789 has 8 divisors (see below), whose sum is σ = 140094432. Its totient is φ = 116210640.

The previous prime is 128125771. The next prime is 128125793. The reversal of 128125789 is 987521821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128125789 - 2¹¹ = 128123741 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 (128125769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8274 + ... + 18019.

It is an arithmetic number, because the mean of its divisors is an integer number (17511804).

Almost surely, 2^128125789 is an apocalyptic number.

It is an amenable number.

128125789 is a deficient number, since it is larger than the sum of its proper divisors (11968643).

128125789 is a wasteful number, since it uses less digits than its factorization.

128125789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26747.

The product of its digits is 80640, while the sum is 43.

The square root of 128125789 is about 11319.2662748077. The cubic root of 128125789 is about 504.1334536264.

The spelling of 128125789 in words is "one hundred twenty-eight million, one hundred twenty-five thousand, seven hundred eighty-nine".