12678649 has 2 divisors, whose sum is σ = 12678650. Its totient is φ = 12678648.

The previous prime is 12678637. The next prime is 12678661. The reversal of 12678649 is 94687621.

It is a balanced prime because it is at equal distance from previous prime (12678637) and next prime (12678661).

It can be written as a sum of positive squares in only one way, i.e., 10936249 + 1742400 = 3307^2 + 1320^2 .

It is a cyclic number.

It is not a de Polignac number, because 12678649 - 2⁹ = 12678137 is a prime.

It is not a weakly prime, because it can be changed into another prime (12678619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6339324 + 6339325.

It is an arithmetic number, because the mean of its divisors is an integer number (6339325).

Almost surely, 2^12678649 is an apocalyptic number.

It is an amenable number.

12678649 is a deficient number, since it is larger than the sum of its proper divisors (1).

12678649 is an equidigital number, since it uses as much as digits as its factorization.

12678649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 43.

The square root of 12678649 is about 3560.7090586005. The cubic root of 12678649 is about 233.1798362331.

The spelling of 12678649 in words is "twelve million, six hundred seventy-eight thousand, six hundred forty-nine".