12987813 has 8 divisors (see below), whose sum is σ = 18335808. Its totient is φ = 8149184.

The previous prime is 12987797. The next prime is 12987829. The reversal of 12987813 is 31878921.

12987813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12987797) and next prime (12987829).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12987813 - 2⁴ = 12987797 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12987833) 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, 127281 + ... + 127382.

It is an arithmetic number, because the mean of its divisors is an integer number (2291976).

Almost surely, 2^12987813 is an apocalyptic number.

It is an amenable number.

12987813 is a deficient number, since it is larger than the sum of its proper divisors (5347995).

12987813 is a wasteful number, since it uses less digits than its factorization.

12987813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254683.

The product of its digits is 24192, while the sum is 39.

The square root of 12987813 is about 3603.8608463702. The cubic root of 12987813 is about 235.0599696053.

The spelling of 12987813 in words is "twelve million, nine hundred eighty-seven thousand, eight hundred thirteen".