12945805 has 4 divisors (see below), whose sum is σ = 15534972. Its totient is φ = 10356640.

The previous prime is 12945799. The next prime is 12945811. The reversal of 12945805 is 50854921.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (12945799) and next prime (12945811).

It can be written as a sum of positive squares in 2 ways, for example, as 4959529 + 7986276 = 2227^2 + 2826^2 .

It is not a de Polignac number, because 12945805 - 2⁷ = 12945677 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 1294576 + ... + 1294585.

It is an arithmetic number, because the mean of its divisors is an integer number (3883743).

Almost surely, 2^12945805 is an apocalyptic number.

It is an amenable number.

12945805 is a deficient number, since it is larger than the sum of its proper divisors (2589167).

12945805 is an equidigital number, since it uses as much as digits as its factorization.

12945805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2589166.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 12945805 is about 3598.0279320761. The cubic root of 12945805 is about 234.8062685819.

The spelling of 12945805 in words is "twelve million, nine hundred forty-five thousand, eight hundred five".