12639567 has 4 divisors (see below), whose sum is σ = 16852760. Its totient is φ = 8426376.

The previous prime is 12639559. The next prime is 12639577. The reversal of 12639567 is 76593621.

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

It is not a de Polignac number, because 12639567 - 2³ = 12639559 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 (12639527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2106592 + ... + 2106597.

It is an arithmetic number, because the mean of its divisors is an integer number (4213190).

Almost surely, 2^12639567 is an apocalyptic number.

12639567 is a deficient number, since it is larger than the sum of its proper divisors (4213193).

12639567 is an equidigital number, since it uses as much as digits as its factorization.

12639567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4213192.

The product of its digits is 68040, while the sum is 39.

The square root of 12639567 is about 3555.2168710221. The cubic root of 12639567 is about 232.9399969519.

It can be divided in two parts, 126 and 39567, that added together give a palindrome (39693).

The spelling of 12639567 in words is "twelve million, six hundred thirty-nine thousand, five hundred sixty-seven".