12865018 has 4 divisors (see below), whose sum is σ = 19297530. Its totient is φ = 6432508.

The previous prime is 12865003. The next prime is 12865019. The reversal of 12865018 is 81056821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81056821 = 113 ⋅717317.

It can be written as a sum of positive squares in only one way, i.e., 11512449 + 1352569 = 3393^2 + 1163^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (12865019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3216253 + ... + 3216256.

Almost surely, 2^12865018 is an apocalyptic number.

12865018 is a deficient number, since it is larger than the sum of its proper divisors (6432512).

12865018 is an equidigital number, since it uses as much as digits as its factorization.

12865018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6432511.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 12865018 is about 3586.7837961048. The cubic root of 12865018 is about 234.3168207118.

The spelling of 12865018 in words is "twelve million, eight hundred sixty-five thousand, eighteen".