12659640 has 96 divisors (see below), whose sum is σ = 44200080. Its totient is φ = 2892288.

The previous prime is 12659629. The next prime is 12659657. The reversal of 12659640 is 4695621.

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, 4804 + ... + 6956.

Almost surely, 2^12659640 is an apocalyptic number.

12659640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12659640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22100040).

12659640 is an abundant number, since it is smaller than the sum of its proper divisors (31540440).

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

12659640 is a wasteful number, since it uses less digits than its factorization.

12659640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2181 (or 2170 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 12659640 is about 3558.0387856233. The cubic root of 12659640 is about 233.0632430386.

The spelling of 12659640 in words is "twelve million, six hundred fifty-nine thousand, six hundred forty".