128885423 has 4 divisors (see below), whose sum is σ = 129657360. Its totient is φ = 128113488.

The previous prime is 128885411. The next prime is 128885431. The reversal of 128885423 is 324588821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128885423 - 2⁸ = 128885167 is a prime.

It is a super-2 number, since 2×128885423² = 33222904523777858, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128885443) 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, 385718 + ... + 386051.

It is an arithmetic number, because the mean of its divisors is an integer number (32414340).

Almost surely, 2^128885423 is an apocalyptic number.

128885423 is a deficient number, since it is larger than the sum of its proper divisors (771937).

128885423 is an equidigital number, since it uses as much as digits as its factorization.

128885423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771936.

The product of its digits is 122880, while the sum is 41.

The square root of 128885423 is about 11352.7715999222. The cubic root of 128885423 is about 505.1277956479.

The spelling of 128885423 in words is "one hundred twenty-eight million, eight hundred eighty-five thousand, four hundred twenty-three".