12878165 has 4 divisors (see below), whose sum is σ = 15453804. Its totient is φ = 10302528.

The previous prime is 12878161. The next prime is 12878171. The reversal of 12878165 is 56187821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56187821 = 5683 ⋅9887.

It can be written as a sum of positive squares in 2 ways, for example, as 4169764 + 8708401 = 2042^2 + 2951^2 .

It is a cyclic number.

It is not a de Polignac number, because 12878165 - 2² = 12878161 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12878161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1287812 + ... + 1287821.

It is an arithmetic number, because the mean of its divisors is an integer number (3863451).

Almost surely, 2^12878165 is an apocalyptic number.

It is an amenable number.

12878165 is a deficient number, since it is larger than the sum of its proper divisors (2575639).

12878165 is an equidigital number, since it uses as much as digits as its factorization.

12878165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2575638.

The product of its digits is 26880, while the sum is 38.

The square root of 12878165 is about 3588.6160284990. The cubic root of 12878165 is about 234.3966111035.

It can be divided in two parts, 1287816 and 5, that added together give a palindrome (1287821).

The spelling of 12878165 in words is "twelve million, eight hundred seventy-eight thousand, one hundred sixty-five".