12128823789 has 4 divisors (see below), whose sum is σ = 16171765056. Its totient is φ = 8085882524.

The previous prime is 12128823731. The next prime is 12128823799. The reversal of 12128823789 is 98732882121.

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 12128823789 - 2⁸ = 12128823533 is a prime.

It is a super-2 number, since 2×12128823789² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12128823799) 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, 2021470629 + ... + 2021470634.

It is an arithmetic number, because the mean of its divisors is an integer number (4042941264).

Almost surely, 2^12128823789 is an apocalyptic number.

It is an amenable number.

12128823789 is a deficient number, since it is larger than the sum of its proper divisors (4042941267).

12128823789 is an equidigital number, since it uses as much as digits as its factorization.

12128823789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4042941266.

The product of its digits is 774144, while the sum is 51.

The spelling of 12128823789 in words is "twelve billion, one hundred twenty-eight million, eight hundred twenty-three thousand, seven hundred eighty-nine".