12981808 has 40 divisors (see below), whose sum is σ = 29680640. Its totient is φ = 5382720.

The previous prime is 12981803. The next prime is 12981827. The reversal of 12981808 is 80818921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12981803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1603 + ... + 5341.

It is an arithmetic number, because the mean of its divisors is an integer number (742016).

Almost surely, 2^12981808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12981808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14840320).

12981808 is an abundant number, since it is smaller than the sum of its proper divisors (16698832).

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

12981808 is a wasteful number, since it uses less digits than its factorization.

12981808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3785 (or 3779 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 37.

The square root of 12981808 is about 3603.0276157698. The cubic root of 12981808 is about 235.0237368508.

The spelling of 12981808 in words is "twelve million, nine hundred eighty-one thousand, eight hundred eight".