12916505 has 16 divisors (see below), whose sum is σ = 17884800. Its totient is φ = 8771712.

The previous prime is 12916499. The next prime is 12916507. The reversal of 12916505 is 50561921.

It is a cyclic number.

It is not a de Polignac number, because 12916505 - 2⁴ = 12916489 is a prime.

It is a super-2 number, since 2×12916505² = 333672202830050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12916507) by changing a digit.

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, 2021 + ... + 5469.

It is an arithmetic number, because the mean of its divisors is an integer number (1117800).

Almost surely, 2^12916505 is an apocalyptic number.

It is an amenable number.

12916505 is a deficient number, since it is larger than the sum of its proper divisors (4968295).

12916505 is a wasteful number, since it uses less digits than its factorization.

12916505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3568.

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 12916505 is about 3593.9539507345. The cubic root of 12916505 is about 234.6289905491.

The spelling of 12916505 in words is "twelve million, nine hundred sixteen thousand, five hundred five".