13389921 has 8 divisors (see below), whose sum is σ = 19836960. Its totient is φ = 8926596.

The previous prime is 13389919. The next prime is 13389953. The reversal of 13389921 is 12998331.

13389921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13389921 - 2¹ = 13389919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13389911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 247935 + ... + 247988.

It is an arithmetic number, because the mean of its divisors is an integer number (2479620).

Almost surely, 2^13389921 is an apocalyptic number.

It is an amenable number.

13389921 is a deficient number, since it is larger than the sum of its proper divisors (6447039).

13389921 is an equidigital number, since it uses as much as digits as its factorization.

13389921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495932 (or 495926 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 13389921 is about 3659.2240980842. The cubic root of 13389921 is about 237.4612073298.

The spelling of 13389921 in words is "thirteen million, three hundred eighty-nine thousand, nine hundred twenty-one".