12392878 has 4 divisors (see below), whose sum is σ = 18589320. Its totient is φ = 6196438.

The previous prime is 12392851. The next prime is 12392879. The reversal of 12392878 is 87829321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87829321 = 53 ⋅1657157.

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 self number, because there is not a number n which added to its sum of digits gives 12392878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12392879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3098218 + ... + 3098221.

It is an arithmetic number, because the mean of its divisors is an integer number (4647330).

Almost surely, 2^12392878 is an apocalyptic number.

12392878 is a deficient number, since it is larger than the sum of its proper divisors (6196442).

12392878 is an equidigital number, since it uses as much as digits as its factorization.

12392878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6196441.

The product of its digits is 48384, while the sum is 40.

The square root of 12392878 is about 3520.3519710393. The cubic root of 12392878 is about 231.4145837853.

The spelling of 12392878 in words is "twelve million, three hundred ninety-two thousand, eight hundred seventy-eight".