12660399 has 12 divisors (see below), whose sum is σ = 18341856. Its totient is φ = 8415072.

The previous prime is 12660377. The next prime is 12660409. The reversal of 12660399 is 99306621.

12660399 is a `hidden beast` number, since 1 + 266 + 0 + 399 = 666.

It is not a de Polignac number, because 12660399 - 2⁹ = 12659887 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12660299) 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 11 ways as a sum of consecutive naturals, for example, 1387 + ... + 5219.

It is an arithmetic number, because the mean of its divisors is an integer number (1528488).

Almost surely, 2^12660399 is an apocalyptic number.

12660399 is a deficient number, since it is larger than the sum of its proper divisors (5681457).

12660399 is a wasteful number, since it uses less digits than its factorization.

12660399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4206 (or 4203 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 12660399 is about 3558.1454439075. The cubic root of 12660399 is about 233.0679006610.

The spelling of 12660399 in words is "twelve million, six hundred sixty thousand, three hundred ninety-nine".