12809646 has 24 divisors (see below), whose sum is σ = 27826344. Its totient is φ = 4258800.

The previous prime is 12809633. The next prime is 12809647. The reversal of 12809646 is 64690821.

12809646 is a `hidden beast` number, since 1 + 2 + 8 + 0 + 9 + 646 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 12809646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12809647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9196 + ... + 10496.

It is an arithmetic number, because the mean of its divisors is an integer number (1159431).

Almost surely, 2^12809646 is an apocalyptic number.

12809646 is an abundant number, since it is smaller than the sum of its proper divisors (15016698).

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

12809646 is a wasteful number, since it uses less digits than its factorization.

12809646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856 (or 1853 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 12809646 is about 3579.0565796031. The cubic root of 12809646 is about 233.9801648758.

The spelling of 12809646 in words is "twelve million, eight hundred nine thousand, six hundred forty-six".