12407805 has 12 divisors (see below), whose sum is σ = 21506940. Its totient is φ = 6617472.

The previous prime is 12407803. The next prime is 12407809. The reversal of 12407805 is 50870421.

It can be written as a sum of positive squares in 2 ways, for example, as 8415801 + 3992004 = 2901^2 + 1998^2 .

It is not a de Polignac number, because 12407805 - 2¹ = 12407803 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12407803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 137820 + ... + 137909.

It is an arithmetic number, because the mean of its divisors is an integer number (1792245).

Almost surely, 2^12407805 is an apocalyptic number.

12407805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12407805 is a deficient number, since it is larger than the sum of its proper divisors (9099135).

12407805 is a wasteful number, since it uses less digits than its factorization.

12407805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275740 (or 275737 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 12407805 is about 3522.4714335250. The cubic root of 12407805 is about 231.5074580831.

It can be divided in two parts, 1240 and 7805, that added together give a triangular number (9045 = T₁₃₄).

The spelling of 12407805 in words is "twelve million, four hundred seven thousand, eight hundred five".