12911965 has 16 divisors (see below), whose sum is σ = 17450496. Its totient is φ = 9086400.

The previous prime is 12911957. The next prime is 12911999. The reversal of 12911965 is 56911921.

It is a happy number.

It is not a de Polignac number, because 12911965 - 2³ = 12911957 is a prime.

It is a super-2 number, since 2×12911965² = 333437680322450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12911965.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2082 + ... + 5491.

It is an arithmetic number, because the mean of its divisors is an integer number (1090656).

Almost surely, 2^12911965 is an apocalyptic number.

It is an amenable number.

12911965 is a deficient number, since it is larger than the sum of its proper divisors (4538531).

12911965 is a wasteful number, since it uses less digits than its factorization.

12911965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7620.

The product of its digits is 4860, while the sum is 34.

The square root of 12911965 is about 3593.3222788946. The cubic root of 12911965 is about 234.6014975483.

The spelling of 12911965 in words is "twelve million, nine hundred eleven thousand, nine hundred sixty-five".