12886978 has 24 divisors (see below), whose sum is σ = 21986748. Its totient is φ = 5630688.

The previous prime is 12886967. The next prime is 12886987. The reversal of 12886978 is 87968821.

It can be written as a sum of positive squares in 2 ways, for example, as 12623809 + 263169 = 3553^2 + 513^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8700 + ... + 10072.

Almost surely, 2^12886978 is an apocalyptic number.

12886978 is a deficient number, since it is larger than the sum of its proper divisors (9099770).

12886978 is a wasteful number, since it uses less digits than its factorization.

12886978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426 (or 1407 counting only the distinct ones).

The product of its digits is 387072, while the sum is 49.

The square root of 12886978 is about 3589.8437291893. The cubic root of 12886978 is about 234.4500676400.

The spelling of 12886978 in words is "twelve million, eight hundred eighty-six thousand, nine hundred seventy-eight".