13733721 has 6 divisors (see below), whose sum is σ = 19837610. Its totient is φ = 9155808.

The previous prime is 13733717. The next prime is 13733747. The reversal of 13733721 is 12733731.

13733721 is digitally balanced in base 3, 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., 10653696 + 3080025 = 3264^2 + 1755^2 .

It is not a de Polignac number, because 13733721 - 2² = 13733717 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 (13733701) 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 5 ways as a sum of consecutive naturals, for example, 762976 + ... + 762993.

Almost surely, 2^13733721 is an apocalyptic number.

It is an amenable number.

13733721 is a deficient number, since it is larger than the sum of its proper divisors (6103889).

13733721 is a wasteful number, since it uses less digits than its factorization.

13733721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1525975 (or 1525972 counting only the distinct ones).

The product of its digits is 2646, while the sum is 27.

The square root of 13733721 is about 3705.9035335529. The cubic root of 13733721 is about 239.4764106398.

The spelling of 13733721 in words is "thirteen million, seven hundred thirty-three thousand, seven hundred twenty-one".