12776905 has 8 divisors (see below), whose sum is σ = 15359112. Its totient is φ = 10203648.

The previous prime is 12776879. The next prime is 12776921. The reversal of 12776905 is 50967721.

It can be written as a sum of positive squares in 4 ways, for example, as 131769 + 12645136 = 363^2 + 3556^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12776905 - 2¹³ = 12768713 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1467 + ... + 5263.

It is an arithmetic number, because the mean of its divisors is an integer number (1919889).

Almost surely, 2^12776905 is an apocalyptic number.

It is an amenable number.

12776905 is a deficient number, since it is larger than the sum of its proper divisors (2582207).

12776905 is an equidigital number, since it uses as much as digits as its factorization.

12776905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4475.

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 12776905 is about 3574.4796824153. The cubic root of 12776905 is about 233.7806464627.

The spelling of 12776905 in words is "twelve million, seven hundred seventy-six thousand, nine hundred five".