13821289 has 4 divisors (see below), whose sum is σ = 14634324. Its totient is φ = 13008256.

The previous prime is 13821263. The next prime is 13821293. The reversal of 13821289 is 98212831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12131289 + 1690000 = 3483^2 + 1300^2 .

It is a cyclic number.

It is not a de Polignac number, because 13821289 - 2⁷ = 13821161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13821209) 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, 406492 + ... + 406525.

It is an arithmetic number, because the mean of its divisors is an integer number (3658581).

Almost surely, 2^13821289 is an apocalyptic number.

It is an amenable number.

13821289 is a deficient number, since it is larger than the sum of its proper divisors (813035).

13821289 is an equidigital number, since it uses as much as digits as its factorization.

13821289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813034.

The product of its digits is 6912, while the sum is 34.

The square root of 13821289 is about 3717.6994230303. The cubic root of 13821289 is about 239.9843103169.

The spelling of 13821289 in words is "thirteen million, eight hundred twenty-one thousand, two hundred eighty-nine".