12428879 has 4 divisors (see below), whose sum is σ = 12460584. Its totient is φ = 12397176.

The previous prime is 12428837. The next prime is 12428891. The reversal of 12428879 is 97882421.

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 12428879 - 2⁸ = 12428623 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 (12428279) 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, 15257 + ... + 16050.

It is an arithmetic number, because the mean of its divisors is an integer number (3115146).

Almost surely, 2^12428879 is an apocalyptic number.

12428879 is a deficient number, since it is larger than the sum of its proper divisors (31705).

12428879 is an equidigital number, since it uses as much as digits as its factorization.

12428879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31704.

The product of its digits is 64512, while the sum is 41.

The square root of 12428879 is about 3525.4615300695. The cubic root of 12428879 is about 231.6384516702.

The spelling of 12428879 in words is "twelve million, four hundred twenty-eight thousand, eight hundred seventy-nine".