13889865 has 16 divisors (see below), whose sum is σ = 24244416. Its totient is φ = 6734400.

The previous prime is 13889831. The next prime is 13889873. The reversal of 13889865 is 56898831.

It is not a de Polignac number, because 13889865 - 2⁷ = 13889737 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41926 + ... + 42255.

It is an arithmetic number, because the mean of its divisors is an integer number (1515276).

Almost surely, 2^13889865 is an apocalyptic number.

13889865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13889865 is a deficient number, since it is larger than the sum of its proper divisors (10354551).

13889865 is a wasteful number, since it uses less digits than its factorization.

13889865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84200.

The product of its digits is 414720, while the sum is 48.

The square root of 13889865 is about 3726.9109192467. The cubic root of 13889865 is about 240.3805594360.

The spelling of 13889865 in words is "thirteen million, eight hundred eighty-nine thousand, eight hundred sixty-five".