12605639 has 4 divisors (see below), whose sum is σ = 12705024. Its totient is φ = 12506256.

The previous prime is 12605629. The next prime is 12605647. The reversal of 12605639 is 93650621.

It is a happy number.

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 12605639 - 2¹² = 12601543 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 (12605629) 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, 49502 + ... + 49755.

It is an arithmetic number, because the mean of its divisors is an integer number (3176256).

Almost surely, 2^12605639 is an apocalyptic number.

12605639 is a deficient number, since it is larger than the sum of its proper divisors (99385).

12605639 is an equidigital number, since it uses as much as digits as its factorization.

12605639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99384.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 12605639 is about 3550.4420851494. The cubic root of 12605639 is about 232.7313856334.

The spelling of 12605639 in words is "twelve million, six hundred five thousand, six hundred thirty-nine".