13878805 has 4 divisors (see below), whose sum is σ = 16654572. Its totient is φ = 11103040.

The previous prime is 13878803. The next prime is 13878841. The reversal of 13878805 is 50887831.

13878805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 8538084 + 5340721 = 2922^2 + 2311^2 .

It is not a de Polignac number, because 13878805 - 2¹ = 13878803 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13878803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1387876 + ... + 1387885.

It is an arithmetic number, because the mean of its divisors is an integer number (4163643).

Almost surely, 2^13878805 is an apocalyptic number.

It is an amenable number.

13878805 is a deficient number, since it is larger than the sum of its proper divisors (2775767).

13878805 is an equidigital number, since it uses as much as digits as its factorization.

13878805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2775766.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 13878805 is about 3725.4268211844. The cubic root of 13878805 is about 240.3167403623.

The spelling of 13878805 in words is "thirteen million, eight hundred seventy-eight thousand, eight hundred five".