12987913 has 4 divisors (see below), whose sum is σ = 13022208. Its totient is φ = 12953620.

The previous prime is 12987907. The next prime is 12987917. The reversal of 12987913 is 31978921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12987913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12987917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16573 + ... + 17338.

It is an arithmetic number, because the mean of its divisors is an integer number (3255552).

Almost surely, 2^12987913 is an apocalyptic number.

It is an amenable number.

12987913 is a deficient number, since it is larger than the sum of its proper divisors (34295).

12987913 is an equidigital number, since it uses as much as digits as its factorization.

12987913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34294.

The product of its digits is 27216, while the sum is 40.

The square root of 12987913 is about 3603.8747203531. The cubic root of 12987913 is about 235.0605728872.

The spelling of 12987913 in words is "twelve million, nine hundred eighty-seven thousand, nine hundred thirteen".