12539646 has 48 divisors (see below), whose sum is σ = 32408064. Its totient is φ = 3426192.

The previous prime is 12539603. The next prime is 12539663. The reversal of 12539646 is 64693521.

It is a happy number.

12539646 is a `hidden beast` number, since 1 + 2 + 5 + 3 + 9 + 646 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12539646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 735 + ... + 5061.

It is an arithmetic number, because the mean of its divisors is an integer number (675168).

Almost surely, 2^12539646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12539646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16204032).

12539646 is an abundant number, since it is smaller than the sum of its proper divisors (19868418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12539646 is a wasteful number, since it uses less digits than its factorization.

12539646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4365 (or 4362 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 12539646 is about 3541.1362583216. The cubic root of 12539646 is about 232.3245433095.

The spelling of 12539646 in words is "twelve million, five hundred thirty-nine thousand, six hundred forty-six".