12656140 has 24 divisors (see below), whose sum is σ = 30375072. Its totient is φ = 4339200.

The previous prime is 12656129. The next prime is 12656159. The reversal of 12656140 is 4165621.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45061 + ... + 45340.

It is an arithmetic number, because the mean of its divisors is an integer number (1265628).

Almost surely, 2^12656140 is an apocalyptic number.

12656140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12656140 is an abundant number, since it is smaller than the sum of its proper divisors (17718932).

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

12656140 is a wasteful number, since it uses less digits than its factorization.

12656140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90417 (or 90415 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 12656140 is about 3557.5469076317. The cubic root of 12656140 is about 233.0417627928.

The spelling of 12656140 in words is "twelve million, six hundred fifty-six thousand, one hundred forty".