13775729 has 24 divisors (see below), whose sum is σ = 16556904. Its totient is φ = 11404800.

The previous prime is 13775719. The next prime is 13775753. The reversal of 13775729 is 92757731.

13775729 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 4 ways, for example, as 2371600 + 11404129 = 1540^2 + 3377^2 .

It is not a de Polignac number, because 13775729 - 2⁸ = 13775473 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13775719) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76019 + ... + 76199.

It is an arithmetic number, because the mean of its divisors is an integer number (689871).

Almost surely, 2^13775729 is an apocalyptic number.

It is an amenable number.

13775729 is a deficient number, since it is larger than the sum of its proper divisors (2781175).

13775729 is a wasteful number, since it uses less digits than its factorization.

13775729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 246 counting only the distinct ones).

The product of its digits is 92610, while the sum is 41.

The square root of 13775729 is about 3711.5669197793. The cubic root of 13775729 is about 239.7203281604.

The spelling of 13775729 in words is "thirteen million, seven hundred seventy-five thousand, seven hundred twenty-nine".