12391879 has 4 divisors (see below), whose sum is σ = 12655584. Its totient is φ = 12128176.

The previous prime is 12391867. The next prime is 12391913. The reversal of 12391879 is 97819321.

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 12391879 - 2⁷ = 12391751 is a prime.

It is a super-3 number, since 3×12391879³ (a number of 22 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12391679) 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, 131782 + ... + 131875.

It is an arithmetic number, because the mean of its divisors is an integer number (3163896).

Almost surely, 2^12391879 is an apocalyptic number.

12391879 is a deficient number, since it is larger than the sum of its proper divisors (263705).

12391879 is an equidigital number, since it uses as much as digits as its factorization.

12391879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263704.

The product of its digits is 27216, while the sum is 40.

The square root of 12391879 is about 3520.2100789584. The cubic root of 12391879 is about 231.4083654454.

The spelling of 12391879 in words is "twelve million, three hundred ninety-one thousand, eight hundred seventy-nine".