13878065 has 4 divisors (see below), whose sum is σ = 16653684. Its totient is φ = 11102448.

The previous prime is 13878047. The next prime is 13878089. The reversal of 13878065 is 56087831.

13878065 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 1982464 + 11895601 = 1408^2 + 3449^2 .

It is a cyclic number.

It is not a de Polignac number, because 13878065 - 2¹⁰ = 13877041 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1387802 + ... + 1387811.

It is an arithmetic number, because the mean of its divisors is an integer number (4163421).

Almost surely, 2^13878065 is an apocalyptic number.

It is an amenable number.

13878065 is a deficient number, since it is larger than the sum of its proper divisors (2775619).

13878065 is an equidigital number, since it uses as much as digits as its factorization.

13878065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2775618.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 13878065 is about 3725.3275023815. The cubic root of 13878065 is about 240.3124691601.

The spelling of 13878065 in words is "thirteen million, eight hundred seventy-eight thousand, sixty-five".