12997866 has 64 divisors (see below), whose sum is σ = 31334400. Its totient is φ = 3516480.

The previous prime is 12997849. The next prime is 12997909. The reversal of 12997866 is 66879921.

12997866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87160 + ... + 87308.

It is an arithmetic number, because the mean of its divisors is an integer number (489600).

Almost surely, 2^12997866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12997866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15667200).

12997866 is an abundant number, since it is smaller than the sum of its proper divisors (18336534).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12997866 is a wasteful number, since it uses less digits than its factorization.

12997866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259.

The product of its digits is 326592, while the sum is 48.

The square root of 12997866 is about 3605.2553307637. The cubic root of 12997866 is about 235.1206020469.

The spelling of 12997866 in words is "twelve million, nine hundred ninety-seven thousand, eight hundred sixty-six".