128875389 has 4 divisors (see below), whose sum is σ = 171833856. Its totient is φ = 85916924.

The previous prime is 128875381. The next prime is 128875393. The reversal of 128875389 is 983578821.

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 128875389 - 2³ = 128875381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128875381) 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, 21479229 + ... + 21479234.

It is an arithmetic number, because the mean of its divisors is an integer number (42958464).

Almost surely, 2^128875389 is an apocalyptic number.

It is an amenable number.

128875389 is a deficient number, since it is larger than the sum of its proper divisors (42958467).

128875389 is an equidigital number, since it uses as much as digits as its factorization.

128875389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42958466.

The product of its digits is 967680, while the sum is 51.

The square root of 128875389 is about 11352.3296728028. The cubic root of 128875389 is about 505.1146868890.

The spelling of 128875389 in words is "one hundred twenty-eight million, eight hundred seventy-five thousand, three hundred eighty-nine".