12812905 has 16 divisors (see below), whose sum is σ = 17948160. Its totient is φ = 8597952.

The previous prime is 12812893. The next prime is 12812963. The reversal of 12812905 is 50921821.

It is a Cunningham number, because it is equal to 234³+1.

It is a cyclic number.

It is not a de Polignac number, because 12812905 - 2⁷ = 12812777 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2250 + ... + 5539.

It is an arithmetic number, because the mean of its divisors is an integer number (1121760).

Almost surely, 2^12812905 is an apocalyptic number.

It is an amenable number.

12812905 is a deficient number, since it is larger than the sum of its proper divisors (5135255).

12812905 is an equidigital number, since it uses as much as digits as its factorization.

12812905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7848.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 12812905 is about 3579.5118382260. The cubic root of 12812905 is about 234.0000060876. Note that the first 5 decimals are identical.

It can be divided in two parts, 1281 and 2905, that added together give a triangular number (4186 = T₉₁).

The spelling of 12812905 in words is "twelve million, eight hundred twelve thousand, nine hundred five".