12806865 has 24 divisors (see below), whose sum is σ = 23505768. Its totient is φ = 6428160.

The previous prime is 12806863. The next prime is 12806873. The reversal of 12806865 is 56860821.

It is a happy number.

12806865 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 6395841 + 6411024 = 2529^2 + 2532^2 .

It is not a de Polignac number, because 12806865 - 2¹ = 12806863 is a prime.

It is a super-2 number, since 2×12806865² = 328031582256450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12806861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7606 + ... + 9135.

It is an arithmetic number, because the mean of its divisors is an integer number (979407).

Almost surely, 2^12806865 is an apocalyptic number.

12806865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12806865 is a deficient number, since it is larger than the sum of its proper divisors (10698903).

12806865 is a wasteful number, since it uses less digits than its factorization.

12806865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16769 (or 16766 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 12806865 is about 3578.6680483107. The cubic root of 12806865 is about 233.9632311283.

The spelling of 12806865 in words is "twelve million, eight hundred six thousand, eight hundred sixty-five".