12646404 has 18 divisors (see below), whose sum is σ = 31967390. Its totient is φ = 4215456.

The previous prime is 12646391. The next prime is 12646411. The reversal of 12646404 is 40464621.

12646404 is a `hidden beast` number, since 12 + 6 + 4 + 640 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11088900 + 1557504 = 3330^2 + 1248^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 175609 + ... + 175680.

Almost surely, 2^12646404 is an apocalyptic number.

It is an amenable number.

12646404 is an abundant number, since it is smaller than the sum of its proper divisors (19320986).

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

12646404 is a wasteful number, since it uses less digits than its factorization.

12646404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351299 (or 351294 counting only the distinct ones).

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

The square root of 12646404 is about 3556.1782857444. The cubic root of 12646404 is about 232.9819900488.

It can be divided in two parts, 12 and 646404, that added together give a square (646416 = 804²).

The spelling of 12646404 in words is "twelve million, six hundred forty-six thousand, four hundred four".