13998389 has 4 divisors (see below), whose sum is σ = 14007180. Its totient is φ = 13989600.

The previous prime is 13998353. The next prime is 13998427. The reversal of 13998389 is 98389931.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 9302500 + 4695889 = 3050^2 + 2167^2 .

It is a cyclic number.

It is not a de Polignac number, because 13998389 - 2⁸ = 13998133 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 (13998319) 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 3 ways as a sum of consecutive naturals, for example, 1262 + ... + 5439.

It is an arithmetic number, because the mean of its divisors is an integer number (3501795).

Almost surely, 2^13998389 is an apocalyptic number.

It is an amenable number.

13998389 is a deficient number, since it is larger than the sum of its proper divisors (8791).

13998389 is an equidigital number, since it uses as much as digits as its factorization.

13998389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8790.

The product of its digits is 419904, while the sum is 50.

The square root of 13998389 is about 3741.4421016501. The cubic root of 13998389 is about 241.0049814458.

The spelling of 13998389 in words is "thirteen million, nine hundred ninety-eight thousand, three hundred eighty-nine".