13865378 has 6 divisors (see below), whose sum is σ = 20805969. Its totient is φ = 6930056.

The previous prime is 13865363. The next prime is 13865419. The reversal of 13865378 is 87356831.

It can be written as a sum of positive squares in 2 ways, for example, as 12061729 + 1803649 = 3473^2 + 1343^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=2633.

It is a Duffinian 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 2 ways as a sum of consecutive naturals, for example, 3950 + ... + 6582.

Almost surely, 2^13865378 is an apocalyptic number.

13865378 is a deficient number, since it is larger than the sum of its proper divisors (6940591).

13865378 is an frugal number, since it uses more digits than its factorization.

13865378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5268 (or 2635 counting only the distinct ones).

The product of its digits is 120960, while the sum is 41.

The square root of 13865378 is about 3723.6243097284. The cubic root of 13865378 is about 240.2392175017.

The spelling of 13865378 in words is "thirteen million, eight hundred sixty-five thousand, three hundred seventy-eight".