12981886 has 4 divisors (see below), whose sum is σ = 19472832. Its totient is φ = 6490942.

The previous prime is 12981869. The next prime is 12981893. The reversal of 12981886 is 68818921.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3245470 + ... + 3245473.

It is an arithmetic number, because the mean of its divisors is an integer number (4868208).

Almost surely, 2^12981886 is an apocalyptic number.

12981886 is a deficient number, since it is larger than the sum of its proper divisors (6490946).

12981886 is an equidigital number, since it uses as much as digits as its factorization.

12981886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6490945.

The product of its digits is 55296, while the sum is 43.

The square root of 12981886 is about 3603.0384399837. The cubic root of 12981886 is about 235.0242075561.

The spelling of 12981886 in words is "twelve million, nine hundred eighty-one thousand, eight hundred eighty-six".