12640473 has 6 divisors (see below), whose sum is σ = 18258474. Its totient is φ = 8426976.

The previous prime is 12640451. The next prime is 12640477. The reversal of 12640473 is 37404621.

12640473 is a `hidden beast` number, since 12 + 640 + 4 + 7 + 3 = 666.

12640473 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 10575504 + 2064969 = 3252^2 + 1437^2 .

It is not a de Polignac number, because 12640473 - 2⁸ = 12640217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12640477) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 702240 + ... + 702257.

It is an arithmetic number, because the mean of its divisors is an integer number (3043079).

Almost surely, 2^12640473 is an apocalyptic number.

It is an amenable number.

12640473 is a deficient number, since it is larger than the sum of its proper divisors (5618001).

12640473 is a wasteful number, since it uses less digits than its factorization.

12640473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1404503 (or 1404500 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 12640473 is about 3555.3442871261. The cubic root of 12640473 is about 232.9455625063.

The spelling of 12640473 in words is "twelve million, six hundred forty thousand, four hundred seventy-three".