12861328 has 20 divisors (see below), whose sum is σ = 26230960. Its totient is φ = 6092064.

The previous prime is 12861323. The next prime is 12861337. The reversal of 12861328 is 82316821.

It is a self number, because there is not a number n which added to its sum of digits gives 12861328.

It is not an unprimeable number, because it can be changed into a prime (12861323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20850 + ... + 21457.

It is an arithmetic number, because the mean of its divisors is an integer number (1311548).

Almost surely, 2^12861328 is an apocalyptic number.

It is an amenable number.

12861328 is an abundant number, since it is smaller than the sum of its proper divisors (13369632).

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

12861328 is a wasteful number, since it uses less digits than its factorization.

12861328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42334 (or 42328 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 12861328 is about 3586.2693708086. The cubic root of 12861328 is about 234.2944159823.

The spelling of 12861328 in words is "twelve million, eight hundred sixty-one thousand, three hundred twenty-eight".