13920889 has 4 divisors (see below), whose sum is σ = 13928356. Its totient is φ = 13913424.

The previous prime is 13920887. The next prime is 13920913. The reversal of 13920889 is 98802931.

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 6451600 + 7469289 = 2540^2 + 2733^2 .

It is a cyclic number.

It is not a de Polignac number, because 13920889 - 2¹ = 13920887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13920887) 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, 1687 + ... + 5539.

It is an arithmetic number, because the mean of its divisors is an integer number (3482089).

Almost surely, 2^13920889 is an apocalyptic number.

It is an amenable number.

13920889 is a deficient number, since it is larger than the sum of its proper divisors (7467).

13920889 is an equidigital number, since it uses as much as digits as its factorization.

13920889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7466.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 13920889 is about 3731.0707578388. The cubic root of 13920889 is about 240.5593953719.

The spelling of 13920889 in words is "thirteen million, nine hundred twenty thousand, eight hundred eighty-nine".