12665878 has 4 divisors (see below), whose sum is σ = 18998820. Its totient is φ = 6332938.

The previous prime is 12665869. The next prime is 12665927. The reversal of 12665878 is 87856621.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3166468 + ... + 3166471.

It is an arithmetic number, because the mean of its divisors is an integer number (4749705).

Almost surely, 2^12665878 is an apocalyptic number.

12665878 is a deficient number, since it is larger than the sum of its proper divisors (6332942).

12665878 is an equidigital number, since it uses as much as digits as its factorization.

12665878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6332941.

The product of its digits is 161280, while the sum is 43.

The square root of 12665878 is about 3558.9152841842. The cubic root of 12665878 is about 233.1015171597.

It can be divided in two parts, 126658 and 78, that added together give a square (126736 = 356²).

The spelling of 12665878 in words is "twelve million, six hundred sixty-five thousand, eight hundred seventy-eight".