12987816 has 64 divisors (see below), whose sum is σ = 33929280. Its totient is φ = 4139520.

The previous prime is 12987797. The next prime is 12987829. The reversal of 12987816 is 61878921.

It is an alternating number because its digits alternate between odd and even.

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 in 15 ways as a sum of consecutive naturals, for example, 65830 + ... + 66026.

It is an arithmetic number, because the mean of its divisors is an integer number (530145).

Almost surely, 2^12987816 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 12987816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16964640).

12987816 is an abundant number, since it is smaller than the sum of its proper divisors (20941464).

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

12987816 is a wasteful number, since it uses less digits than its factorization.

12987816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314 (or 310 counting only the distinct ones).

The product of its digits is 48384, while the sum is 42.

The square root of 12987816 is about 3603.8612625904. The cubic root of 12987816 is about 235.0599877038.

The spelling of 12987816 in words is "twelve million, nine hundred eighty-seven thousand, eight hundred sixteen".