12564215 has 4 divisors (see below), whose sum is σ = 15077064. Its totient is φ = 10051368.

The previous prime is 12564193. The next prime is 12564247. The reversal of 12564215 is 51246521.

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

It is a cyclic number.

It is not a de Polignac number, because 12564215 - 2⁶ = 12564151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1256417 + ... + 1256426.

It is an arithmetic number, because the mean of its divisors is an integer number (3769266).

Almost surely, 2^12564215 is an apocalyptic number.

12564215 is a deficient number, since it is larger than the sum of its proper divisors (2512849).

12564215 is an equidigital number, since it uses as much as digits as its factorization.

12564215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2512848.

The product of its digits is 2400, while the sum is 26.

The square root of 12564215 is about 3544.6036449792. The cubic root of 12564215 is about 232.4761759224.

The spelling of 12564215 in words is "twelve million, five hundred sixty-four thousand, two hundred fifteen".