12690878 has 4 divisors (see below), whose sum is σ = 19036320. Its totient is φ = 6345438.

The previous prime is 12690859. The next prime is 12690883. The reversal of 12690878 is 87809621.

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

It is a super-2 number, since 2×12690878² = 322116768821768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3172718 + ... + 3172721.

It is an arithmetic number, because the mean of its divisors is an integer number (4759080).

Almost surely, 2^12690878 is an apocalyptic number.

12690878 is a deficient number, since it is larger than the sum of its proper divisors (6345442).

12690878 is an equidigital number, since it uses as much as digits as its factorization.

12690878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6345441.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 12690878 is about 3562.4258588776. The cubic root of 12690878 is about 233.2547821757.

The spelling of 12690878 in words is "twelve million, six hundred ninety thousand, eight hundred seventy-eight".