12656240 has 40 divisors (see below), whose sum is σ = 29582928. Its totient is φ = 5035520.

The previous prime is 12656239. The next prime is 12656243. The reversal of 12656240 is 4265621.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12656243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22199 + ... + 22761.

Almost surely, 2^12656240 is an apocalyptic number.

12656240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12656240 is an abundant number, since it is smaller than the sum of its proper divisors (16926688).

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

12656240 is a wasteful number, since it uses less digits than its factorization.

12656240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857 (or 851 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 12656240 is about 3557.5609622324. The cubic root of 12656240 is about 233.0423765691.

The spelling of 12656240 in words is "twelve million, six hundred fifty-six thousand, two hundred forty".