13821338 has 8 divisors (see below), whose sum is σ = 20864532. Its totient is φ = 6866496.

The previous prime is 13821329. The next prime is 13821343. The reversal of 13821338 is 83312831.

It can be written as a sum of positive squares in 2 ways, for example, as 13786369 + 34969 = 3713^2 + 187^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×13821338² = 382058768220488, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13821338.

It is an unprimeable number.

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, 21695 + ... + 22322.

Almost surely, 2^13821338 is an apocalyptic number.

13821338 is a deficient number, since it is larger than the sum of its proper divisors (7043194).

13821338 is a wasteful number, since it uses less digits than its factorization.

13821338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44176.

The product of its digits is 3456, while the sum is 29.

The square root of 13821338 is about 3717.7060131215. The cubic root of 13821338 is about 239.9845939185.

The spelling of 13821338 in words is "thirteen million, eight hundred twenty-one thousand, three hundred thirty-eight".