12640446 has 48 divisors (see below), whose sum is σ = 33712224. Its totient is φ = 3333312.

The previous prime is 12640429. The next prime is 12640451. The reversal of 12640446 is 64404621.

12640446 is a `hidden beast` number, since 12 + 640 + 4 + 4 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 2221 + ... + 5496.

It is an arithmetic number, because the mean of its divisors is an integer number (702338).

Almost surely, 2^12640446 is an apocalyptic number.

12640446 is an abundant number, since it is smaller than the sum of its proper divisors (21071778).

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

12640446 is a wasteful number, since it uses less digits than its factorization.

12640446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7745 (or 7742 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 12640446 is about 3555.3404900234. The cubic root of 12640446 is about 232.9453966493.

The spelling of 12640446 in words is "twelve million, six hundred forty thousand, four hundred forty-six".