13805845 has 4 divisors (see below), whose sum is σ = 16567020. Its totient is φ = 11044672.

The previous prime is 13805843. The next prime is 13805851. The reversal of 13805845 is 54850831.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3908529 + 9897316 = 1977^2 + 3146^2 .

It is a cyclic number.

It is not a de Polignac number, because 13805845 - 2¹ = 13805843 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13805845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13805843) by changing a digit.

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, 1380580 + ... + 1380589.

It is an arithmetic number, because the mean of its divisors is an integer number (4141755).

Almost surely, 2^13805845 is an apocalyptic number.

It is an amenable number.

13805845 is a deficient number, since it is larger than the sum of its proper divisors (2761175).

13805845 is an equidigital number, since it uses as much as digits as its factorization.

13805845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2761174.

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 13805845 is about 3715.6217514704. The cubic root of 13805845 is about 239.8948903158.

It can be divided in two parts, 1380 and 5845, that added together give a square (7225 = 85²).

The spelling of 13805845 in words is "thirteen million, eight hundred five thousand, eight hundred forty-five".