12640445 has 8 divisors (see below), whose sum is σ = 15310944. Its totient is φ = 10017424.

The previous prime is 12640429. The next prime is 12640451. The reversal of 12640445 is 54404621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12640445 - 2⁴ = 12640429 is a prime.

It is a Duffinian number.

It is a Curzon number.

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 7 ways as a sum of consecutive naturals, for example, 11279 + ... + 12348.

It is an arithmetic number, because the mean of its divisors is an integer number (1913868).

Almost surely, 2^12640445 is an apocalyptic number.

It is an amenable number.

12640445 is a deficient number, since it is larger than the sum of its proper divisors (2670499).

12640445 is a wasteful number, since it uses less digits than its factorization.

12640445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23739.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 12640445 is about 3555.3403493899. The cubic root of 12640445 is about 232.9453905064.

The spelling of 12640445 in words is "twelve million, six hundred forty thousand, four hundred forty-five".