12940805 has 16 divisors (see below), whose sum is σ = 16459200. Its totient is φ = 9740160.

The previous prime is 12940777. The next prime is 12940813. The reversal of 12940805 is 50804921.

It is not a de Polignac number, because 12940805 - 2¹² = 12936709 is a prime.

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, 16625 + ... + 17385.

It is an arithmetic number, because the mean of its divisors is an integer number (1028700).

Almost surely, 2^12940805 is an apocalyptic number.

It is an amenable number.

12940805 is a deficient number, since it is larger than the sum of its proper divisors (3518395).

12940805 is a wasteful number, since it uses less digits than its factorization.

12940805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 12940805 is about 3597.3330399061. Note that the first 3 decimals coincide. The cubic root of 12940805 is about 234.7760352998.

The spelling of 12940805 in words is "twelve million, nine hundred forty thousand, eight hundred five".