12640415 has 24 divisors (see below), whose sum is σ = 16459200. Its totient is φ = 9313344.

The previous prime is 12640399. The next prime is 12640427. The reversal of 12640415 is 51404621.

It is not a de Polignac number, because 12640415 - 2⁴ = 12640399 is a prime.

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, 84761 + ... + 84909.

It is an arithmetic number, because the mean of its divisors is an integer number (685800).

Almost surely, 2^12640415 is an apocalyptic number.

12640415 is a deficient number, since it is larger than the sum of its proper divisors (3818785).

12640415 is a wasteful number, since it uses less digits than its factorization.

12640415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 12640415 is about 3555.3361303820. The cubic root of 12640415 is about 232.9452062205.

The spelling of 12640415 in words is "twelve million, six hundred forty thousand, four hundred fifteen".