12918965 has 4 divisors (see below), whose sum is σ = 15502764. Its totient is φ = 10335168.

The previous prime is 12918943. The next prime is 12918979. The reversal of 12918965 is 56981921.

It is a happy number.

12918965 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56981921 = 149 ⋅382429.

It can be written as a sum of positive squares in 2 ways, for example, as 7091569 + 5827396 = 2663^2 + 2414^2 .

It is a cyclic number.

It is not a de Polignac number, because 12918965 - 2⁶ = 12918901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1291892 + ... + 1291901.

It is an arithmetic number, because the mean of its divisors is an integer number (3875691).

Almost surely, 2^12918965 is an apocalyptic number.

It is an amenable number.

12918965 is a deficient number, since it is larger than the sum of its proper divisors (2583799).

12918965 is an equidigital number, since it uses as much as digits as its factorization.

12918965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2583798.

The product of its digits is 38880, while the sum is 41.

The square root of 12918965 is about 3594.2961758876. The cubic root of 12918965 is about 234.6438849466.

The spelling of 12918965 in words is "twelve million, nine hundred eighteen thousand, nine hundred sixty-five".