12817387 has 4 divisors (see below), whose sum is σ = 13982616. Its totient is φ = 11652160.

The previous prime is 12817373. The next prime is 12817421. The reversal of 12817387 is 78371821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12817387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12817307) 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, 582598 + ... + 582619.

It is an arithmetic number, because the mean of its divisors is an integer number (3495654).

Almost surely, 2^12817387 is an apocalyptic number.

12817387 is a deficient number, since it is larger than the sum of its proper divisors (1165229).

12817387 is a wasteful number, since it uses less digits than its factorization.

12817387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1165228.

The product of its digits is 18816, while the sum is 37.

The square root of 12817387 is about 3580.1378465081. The cubic root of 12817387 is about 234.0272875865.

It can be divided in two parts, 1281 and 7387, that added together give a palindrome (8668).

The spelling of 12817387 in words is "twelve million, eight hundred seventeen thousand, three hundred eighty-seven".