13840321 has 4 divisors (see below), whose sum is σ = 15098544. Its totient is φ = 12582100.

The previous prime is 13840271. The next prime is 13840327. The reversal of 13840321 is 12304831.

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 a cyclic number.

It is not a de Polignac number, because 13840321 - 2¹⁷ = 13709249 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13840292 and 13840301.

It is not an unprimeable number, because it can be changed into a prime (13840327) 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, 629095 + ... + 629116.

It is an arithmetic number, because the mean of its divisors is an integer number (3774636).

Almost surely, 2^13840321 is an apocalyptic number.

13840321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13840321 is a deficient number, since it is larger than the sum of its proper divisors (1258223).

13840321 is a wasteful number, since it uses less digits than its factorization.

13840321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258222.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 13840321 is about 3720.2581899648. The cubic root of 13840321 is about 240.0944130856.

It can be divided in two parts, 13840 and 321, that added together give a square (14161 = 119²).

The spelling of 13840321 in words is "thirteen million, eight hundred forty thousand, three hundred twenty-one".