12640945 has 16 divisors (see below), whose sum is σ = 16201728. Its totient is φ = 9434880.

The previous prime is 12640931. The next prime is 12640951. The reversal of 12640945 is 54904621.

It is not a de Polignac number, because 12640945 - 2¹¹ = 12638897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10210 + ... + 11380.

It is an arithmetic number, because the mean of its divisors is an integer number (1012608).

Almost surely, 2^12640945 is an apocalyptic number.

It is an amenable number.

12640945 is a deficient number, since it is larger than the sum of its proper divisors (3560783).

12640945 is a wasteful number, since it uses less digits than its factorization.

12640945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 12640945 is about 3555.4106654506. The cubic root of 12640945 is about 232.9484618951.

The spelling of 12640945 in words is "twelve million, six hundred forty thousand, nine hundred forty-five".