12659540 has 12 divisors (see below), whose sum is σ = 26585076. Its totient is φ = 5063808.

The previous prime is 12659539. The next prime is 12659557. The reversal of 12659540 is 4595621.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7118224 + 5541316 = 2668^2 + 2354^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12659497 and 12659506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316469 + ... + 316508.

It is an arithmetic number, because the mean of its divisors is an integer number (2215423).

Almost surely, 2^12659540 is an apocalyptic number.

12659540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12659540 is an abundant number, since it is smaller than the sum of its proper divisors (13925536).

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

12659540 is a wasteful number, since it uses less digits than its factorization.

12659540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632986 (or 632984 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 12659540 is about 3558.0247329101. The cubic root of 12659540 is about 233.0626293722.

The spelling of 12659540 in words is "twelve million, six hundred fifty-nine thousand, five hundred forty".