13939865 has 8 divisors (see below), whose sum is σ = 17304840. Its totient is φ = 10767232.

The previous prime is 13939859. The next prime is 13939943. The reversal of 13939865 is 56893931.

13939865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3545689 + 10394176 = 1883^2 + 3224^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13939865 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47924 + ... + 48213.

It is an arithmetic number, because the mean of its divisors is an integer number (2163105).

Almost surely, 2^13939865 is an apocalyptic number.

It is an amenable number.

13939865 is a deficient number, since it is larger than the sum of its proper divisors (3364975).

13939865 is an equidigital number, since it uses as much as digits as its factorization.

13939865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96171.

The product of its digits is 174960, while the sum is 44.

The square root of 13939865 is about 3733.6128615592. The cubic root of 13939865 is about 240.6686504271.

It can be divided in two parts, 139 and 39865, that added together give a palindrome (40004).

The spelling of 13939865 in words is "thirteen million, nine hundred thirty-nine thousand, eight hundred sixty-five".