12390194879 has 4 divisors (see below), whose sum is σ = 12397130184. Its totient is φ = 12383259576.

The previous prime is 12390194857. The next prime is 12390194891. The reversal of 12390194879 is 97849109321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97849109321 = 47 ⋅2081895943.

It is a cyclic number.

It is not a de Polignac number, because 12390194879 - 2¹² = 12390190783 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12390194879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12390194809) 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, 3464972 + ... + 3468545.

It is an arithmetic number, because the mean of its divisors is an integer number (3099282546).

Almost surely, 2^12390194879 is an apocalyptic number.

12390194879 is a deficient number, since it is larger than the sum of its proper divisors (6935305).

12390194879 is an equidigital number, since it uses as much as digits as its factorization.

12390194879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6935304.

The product of its (nonzero) digits is 979776, while the sum is 53.

The spelling of 12390194879 in words is "twelve billion, three hundred ninety million, one hundred ninety-four thousand, eight hundred seventy-nine".