12864387 has 16 divisors (see below), whose sum is σ = 18144000. Its totient is φ = 8085024.

The previous prime is 12864373. The next prime is 12864389. The reversal of 12864387 is 78346821.

It is not a de Polignac number, because 12864387 - 2¹⁵ = 12831619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12864389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14914 + ... + 15752.

It is an arithmetic number, because the mean of its divisors is an integer number (1134000).

Almost surely, 2^12864387 is an apocalyptic number.

12864387 is a deficient number, since it is larger than the sum of its proper divisors (5279613).

12864387 is a wasteful number, since it uses less digits than its factorization.

12864387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130.

The product of its digits is 64512, while the sum is 39.

The square root of 12864387 is about 3586.6958332147. The cubic root of 12864387 is about 234.3129897461.

The spelling of 12864387 in words is "twelve million, eight hundred sixty-four thousand, three hundred eighty-seven".