12816585 has 12 divisors (see below), whose sum is σ = 22215492. Its totient is φ = 6835488.

The previous prime is 12816581. The next prime is 12816607. The reversal of 12816585 is 58561821.

It can be written as a sum of positive squares in 2 ways, for example, as 2143296 + 10673289 = 1464^2 + 3267^2 .

It is not a de Polignac number, because 12816585 - 2² = 12816581 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12816581) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142362 + ... + 142451.

It is an arithmetic number, because the mean of its divisors is an integer number (1851291).

Almost surely, 2^12816585 is an apocalyptic number.

12816585 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12816585 is a deficient number, since it is larger than the sum of its proper divisors (9398907).

12816585 is a wasteful number, since it uses less digits than its factorization.

12816585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284824 (or 284821 counting only the distinct ones).

The product of its digits is 19200, while the sum is 36.

The square root of 12816585 is about 3580.0258378956. The cubic root of 12816585 is about 234.0224063576.

The spelling of 12816585 in words is "twelve million, eight hundred sixteen thousand, five hundred eighty-five".