12865540 has 24 divisors (see below), whose sum is σ = 27478080. Its totient is φ = 5058528.

The previous prime is 12865537. The next prime is 12865543. The reversal of 12865540 is 4556821.

It is an interprime number because it is at equal distance from previous prime (12865537) and next prime (12865543).

It is not an unprimeable number, because it can be changed into a prime (12865543) 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, 4272 + ... + 6631.

It is an arithmetic number, because the mean of its divisors is an integer number (1144920).

Almost surely, 2^12865540 is an apocalyptic number.

12865540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12865540 is an abundant number, since it is smaller than the sum of its proper divisors (14612540).

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

12865540 is a wasteful number, since it uses less digits than its factorization.

12865540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10971 (or 10969 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 12865540 is about 3586.8565625071. The cubic root of 12865540 is about 234.3199898155.

The spelling of 12865540 in words is "twelve million, eight hundred sixty-five thousand, five hundred forty".