12865515 has 32 divisors (see below), whose sum is σ = 23478336. Its totient is φ = 5959680.

The previous prime is 12865499. The next prime is 12865519. The reversal of 12865515 is 51556821.

It is not a de Polignac number, because 12865515 - 2⁴ = 12865499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12865519) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1375 + ... + 5255.

It is an arithmetic number, because the mean of its divisors is an integer number (733698).

Almost surely, 2^12865515 is an apocalyptic number.

12865515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12865515 is a deficient number, since it is larger than the sum of its proper divisors (10612821).

12865515 is a wasteful number, since it uses less digits than its factorization.

12865515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3919.

The product of its digits is 12000, while the sum is 33.

The square root of 12865515 is about 3586.8530775598. The cubic root of 12865515 is about 234.3198380404.

The spelling of 12865515 in words is "twelve million, eight hundred sixty-five thousand, five hundred fifteen".