12640926 has 16 divisors (see below), whose sum is σ = 26154000. Its totient is φ = 4068288.

The previous prime is 12640919. The next prime is 12640931. The reversal of 12640926 is 62904621.

It is a junction number, because it is equal to n+sod(n) for n = 12640893 and 12640902.

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, 36151 + ... + 36498.

It is an arithmetic number, because the mean of its divisors is an integer number (1634625).

Almost surely, 2^12640926 is an apocalyptic number.

12640926 is an abundant number, since it is smaller than the sum of its proper divisors (13513074).

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

12640926 is a wasteful number, since it uses less digits than its factorization.

12640926 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72683.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 12640926 is about 3555.4079934657. The cubic root of 12640926 is about 232.9483451838.

The spelling of 12640926 in words is "twelve million, six hundred forty thousand, nine hundred twenty-six".