12391065 has 12 divisors (see below), whose sum is σ = 21477924. Its totient is φ = 6608544.

The previous prime is 12391039. The next prime is 12391069. The reversal of 12391065 is 56019321.

12391065 is digitally balanced in base 2 and base 3, 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 2 ways, for example, as 6859161 + 5531904 = 2619^2 + 2352^2 .

It is not a de Polignac number, because 12391065 - 2¹⁰ = 12390041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12391069) 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, 137634 + ... + 137723.

It is an arithmetic number, because the mean of its divisors is an integer number (1789827).

Almost surely, 2^12391065 is an apocalyptic number.

12391065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12391065 is a deficient number, since it is larger than the sum of its proper divisors (9086859).

12391065 is a wasteful number, since it uses less digits than its factorization.

12391065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275368 (or 275365 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 12391065 is about 3520.0944589599. The cubic root of 12391065 is about 231.4032984029.

It can be divided in two parts, 1239 and 1065, that added together give a square (2304 = 48²).

The spelling of 12391065 in words is "twelve million, three hundred ninety-one thousand, sixty-five".