12896978 has 4 divisors (see below), whose sum is σ = 19345470. Its totient is φ = 6448488.

The previous prime is 12896969. The next prime is 12897011. The reversal of 12896978 is 87969821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87969821 = 739 ⋅119039.

It can be written as a sum of positive squares in only one way, i.e., 7360369 + 5536609 = 2713^2 + 2353^2 .

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 as a sum of consecutive naturals, namely, 3224243 + ... + 3224246.

Almost surely, 2^12896978 is an apocalyptic number.

12896978 is a deficient number, since it is larger than the sum of its proper divisors (6448492).

12896978 is an equidigital number, since it uses as much as digits as its factorization.

12896978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6448491.

The product of its digits is 435456, while the sum is 50.

The square root of 12896978 is about 3591.2362773842. The cubic root of 12896978 is about 234.5106945900.

The spelling of 12896978 in words is "twelve million, eight hundred ninety-six thousand, nine hundred seventy-eight".