128530369 has 4 divisors (see below), whose sum is σ = 140214960. Its totient is φ = 116845780.

The previous prime is 128530333. The next prime is 128530399. The reversal of 128530369 is 963035821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128530369 - 2¹⁵ = 128497601 is a prime.

It is a super-2 number, since 2×128530369² = 33040111510552322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128530399) 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, 5842279 + ... + 5842300.

It is an arithmetic number, because the mean of its divisors is an integer number (35053740).

Almost surely, 2^128530369 is an apocalyptic number.

It is an amenable number.

128530369 is a deficient number, since it is larger than the sum of its proper divisors (11684591).

128530369 is a wasteful number, since it uses less digits than its factorization.

128530369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11684590.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 128530369 is about 11337.1234887867. The cubic root of 128530369 is about 504.6635264755.

The spelling of 128530369 in words is "one hundred twenty-eight million, five hundred thirty thousand, three hundred sixty-nine".