12564437 has 4 divisors (see below), whose sum is σ = 12589920. Its totient is φ = 12538956.

The previous prime is 12564427. The next prime is 12564439. The reversal of 12564437 is 73446521.

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, and also an emirpimes, since its reverse is a distinct semiprime: 73446521 = 23 ⋅3193327.

It is a cyclic number.

It is not a de Polignac number, because 12564437 - 2⁴ = 12564421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12564439) 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, 11987 + ... + 12992.

It is an arithmetic number, because the mean of its divisors is an integer number (3147480).

Almost surely, 2^12564437 is an apocalyptic number.

It is an amenable number.

12564437 is a deficient number, since it is larger than the sum of its proper divisors (25483).

12564437 is an equidigital number, since it uses as much as digits as its factorization.

12564437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25482.

The product of its digits is 20160, while the sum is 32.

The square root of 12564437 is about 3544.6349600488. The cubic root of 12564437 is about 232.4775451394.

The spelling of 12564437 in words is "twelve million, five hundred sixty-four thousand, four hundred thirty-seven".