12736978 has 16 divisors (see below), whose sum is σ = 20724984. Its totient is φ = 5847040.

The previous prime is 12736949. The next prime is 12737033. The reversal of 12736978 is 87963721.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5322249 + 7414729 = 2307^2 + 2723^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3175 + ... + 5962.

Almost surely, 2^12736978 is an apocalyptic number.

12736978 is a deficient number, since it is larger than the sum of its proper divisors (7988006).

12736978 is a wasteful number, since it uses less digits than its factorization.

12736978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9197.

The product of its digits is 127008, while the sum is 43.

The square root of 12736978 is about 3568.8903037219. The cubic root of 12736978 is about 233.5368759078.

The spelling of 12736978 in words is "twelve million, seven hundred thirty-six thousand, nine hundred seventy-eight".