13889565 has 24 divisors (see below), whose sum is σ = 24189048. Its totient is φ = 7372800.

The previous prime is 13889531. The next prime is 13889567. The reversal of 13889565 is 56598831.

13889565 is a `hidden beast` number, since 1 + 3 + 8 + 89 + 565 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1058841 + 12830724 = 1029^2 + 3582^2 .

It is a de Polignac number, because none of the positive numbers 2^k-13889565 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 13889565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13889567) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 10965 + ... + 12165.

It is an arithmetic number, because the mean of its divisors is an integer number (1007877).

Almost surely, 2^13889565 is an apocalyptic number.

13889565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13889565 is a deficient number, since it is larger than the sum of its proper divisors (10299483).

13889565 is a wasteful number, since it uses less digits than its factorization.

13889565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1469 (or 1466 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 13889565 is about 3726.8706712200. The cubic root of 13889565 is about 240.3788288051.

The spelling of 13889565 in words is "thirteen million, eight hundred eighty-nine thousand, five hundred sixty-five".