12864385 has 4 divisors (see below), whose sum is σ = 15437268. Its totient is φ = 10291504.

The previous prime is 12864373. The next prime is 12864389. The reversal of 12864385 is 58346821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58346821 = 13 ⋅4488217.

It can be written as a sum of positive squares in 2 ways, for example, as 9054081 + 3810304 = 3009^2 + 1952^2 .

It is a cyclic number.

It is not a de Polignac number, because 12864385 - 2¹¹ = 12862337 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 1286434 + ... + 1286443.

It is an arithmetic number, because the mean of its divisors is an integer number (3859317).

Almost surely, 2^12864385 is an apocalyptic number.

It is an amenable number.

12864385 is a deficient number, since it is larger than the sum of its proper divisors (2572883).

12864385 is an equidigital number, since it uses as much as digits as its factorization.

12864385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2572882.

The product of its digits is 46080, while the sum is 37.

The square root of 12864385 is about 3586.6955544066. The cubic root of 12864385 is about 234.3129776033.

It can be divided in two parts, 1286 and 4385, that added together give a triangular number (5671 = T₁₀₆).

The spelling of 12864385 in words is "twelve million, eight hundred sixty-four thousand, three hundred eighty-five".