13814721 has 6 divisors (see below), whose sum is σ = 19954610. Its totient is φ = 9209808.

The previous prime is 13814719. The next prime is 13814753. The reversal of 13814721 is 12741831.

13814721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 13068225 + 746496 = 3615^2 + 864^2 .

It is not a de Polignac number, because 13814721 - 2¹ = 13814719 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13814711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 767476 + ... + 767493.

Almost surely, 2^13814721 is an apocalyptic number.

It is an amenable number.

13814721 is a deficient number, since it is larger than the sum of its proper divisors (6139889).

13814721 is a wasteful number, since it uses less digits than its factorization.

13814721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534975 (or 1534972 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 13814721 is about 3716.8159760741. The cubic root of 13814721 is about 239.9462900644.

It can be divided in two parts, 13814 and 721, that added together give a triangular number (14535 = T₁₇₀).

The spelling of 13814721 in words is "thirteen million, eight hundred fourteen thousand, seven hundred twenty-one".