13774721 has 4 divisors (see below), whose sum is σ = 13799172. Its totient is φ = 13750272.

The previous prime is 13774703. The next prime is 13774741. The reversal of 13774721 is 12747731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12747731 = 359 ⋅35509.

It can be written as a sum of positive squares in 2 ways, for example, as 8761600 + 5013121 = 2960^2 + 2239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13774721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13774741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11360 + ... + 12513.

It is an arithmetic number, because the mean of its divisors is an integer number (3449793).

Almost surely, 2^13774721 is an apocalyptic number.

It is an amenable number.

13774721 is a deficient number, since it is larger than the sum of its proper divisors (24451).

13774721 is an equidigital number, since it uses as much as digits as its factorization.

13774721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24450.

The product of its digits is 8232, while the sum is 32.

The square root of 13774721 is about 3711.4311255902. The cubic root of 13774721 is about 239.7144810655.

The spelling of 13774721 in words is "thirteen million, seven hundred seventy-four thousand, seven hundred twenty-one".