12678905 has 4 divisors (see below), whose sum is σ = 15214692. Its totient is φ = 10143120.

The previous prime is 12678899. The next prime is 12678929. The reversal of 12678905 is 50987621.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3564544 + 9114361 = 1888^2 + 3019^2 .

It is not a de Polignac number, because 12678905 - 2⁸ = 12678649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1267886 + ... + 1267895.

It is an arithmetic number, because the mean of its divisors is an integer number (3803673).

Almost surely, 2^12678905 is an apocalyptic number.

It is an amenable number.

12678905 is a deficient number, since it is larger than the sum of its proper divisors (2535787).

12678905 is an equidigital number, since it uses as much as digits as its factorization.

12678905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2535786.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 12678905 is about 3560.7450063154. The cubic root of 12678905 is about 233.1814056336.

The spelling of 12678905 in words is "twelve million, six hundred seventy-eight thousand, nine hundred five".