13888989 has 10 divisors (see below), whose sum is σ = 20747870. Its totient is φ = 9259272.

The previous prime is 13888969. The next prime is 13888997. The reversal of 13888989 is 98988831.

It can be written as a sum of positive squares in only one way, i.e., 13816089 + 72900 = 3717^2 + 270^2 .

It is not a de Polignac number, because 13888989 - 2¹⁵ = 13856221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13888939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 85654 + ... + 85815.

It is an arithmetic number, because the mean of its divisors is an integer number (2074787).

Almost surely, 2^13888989 is an apocalyptic number.

It is an amenable number.

13888989 is a deficient number, since it is larger than the sum of its proper divisors (6858881).

13888989 is an equidigital number, since it uses as much as digits as its factorization.

13888989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171481 (or 171472 counting only the distinct ones).

The product of its digits is 995328, while the sum is 54.

The square root of 13888989 is about 3726.7933937904. The cubic root of 13888989 is about 240.3755059240.

The spelling of 13888989 in words is "thirteen million, eight hundred eighty-eight thousand, nine hundred eighty-nine".