13806321 has 4 divisors (see below), whose sum is σ = 18408432. Its totient is φ = 9204212.

The previous prime is 13806319. The next prime is 13806323. The reversal of 13806321 is 12360831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (13806319) and next prime (13806323).

It is a cyclic number.

It is not a de Polignac number, because 13806321 - 2¹ = 13806319 is a prime.

It is a super-3 number, since 3×13806321³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 13806291 and 13806300.

It is not an unprimeable number, because it can be changed into a prime (13806323) 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, 2301051 + ... + 2301056.

It is an arithmetic number, because the mean of its divisors is an integer number (4602108).

Almost surely, 2^13806321 is an apocalyptic number.

It is an amenable number.

13806321 is a deficient number, since it is larger than the sum of its proper divisors (4602111).

13806321 is an equidigital number, since it uses as much as digits as its factorization.

13806321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4602110.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 13806321 is about 3715.6858048010. The cubic root of 13806321 is about 239.8976473281.

The spelling of 13806321 in words is "thirteen million, eight hundred six thousand, three hundred twenty-one".