13946721 has 4 divisors (see below), whose sum is σ = 18595632. Its totient is φ = 9297812.

The previous prime is 13946711. The next prime is 13946747. The reversal of 13946721 is 12764931.

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 13946721 - 2⁶ = 13946657 is a prime.

It is a super-2 number, since 2×13946721² = 389022053303682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13946711) 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, 2324451 + ... + 2324456.

It is an arithmetic number, because the mean of its divisors is an integer number (4648908).

Almost surely, 2^13946721 is an apocalyptic number.

It is an amenable number.

13946721 is a deficient number, since it is larger than the sum of its proper divisors (4648911).

13946721 is an equidigital number, since it uses as much as digits as its factorization.

13946721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4648910.

The product of its digits is 9072, while the sum is 33.

The square root of 13946721 is about 3734.5308942356. The cubic root of 13946721 is about 240.7080997291.

The spelling of 13946721 in words is "thirteen million, nine hundred forty-six thousand, seven hundred twenty-one".