13756321 has 4 divisors (see below), whose sum is σ = 13950144. Its totient is φ = 13562500.

The previous prime is 13756297. The next prime is 13756387. The reversal of 13756321 is 12365731.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12365731 = 7 ⋅1766533.

It is a cyclic number.

It is not a de Polignac number, because 13756321 - 2⁹ = 13755809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13756321.

It is not an unprimeable number, because it can be changed into a prime (13756021) 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, 96805 + ... + 96946.

It is an arithmetic number, because the mean of its divisors is an integer number (3487536).

Almost surely, 2^13756321 is an apocalyptic number.

It is an amenable number.

13756321 is a deficient number, since it is larger than the sum of its proper divisors (193823).

13756321 is an equidigital number, since it uses as much as digits as its factorization.

13756321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193822.

The product of its digits is 3780, while the sum is 28.

The square root of 13756321 is about 3708.9514690813. The cubic root of 13756321 is about 239.6076982169.

The spelling of 13756321 in words is "thirteen million, seven hundred fifty-six thousand, three hundred twenty-one".