13923729 has 12 divisors (see below), whose sum is σ = 20656116. Its totient is φ = 9031392.

The previous prime is 13923719. The next prime is 13923737. The reversal of 13923729 is 92732931.

13923729 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 2 ways, for example, as 7033104 + 6890625 = 2652^2 + 2625^2 .

It is not a de Polignac number, because 13923729 - 2⁷ = 13923601 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13923693 and 13923702.

It is not an unprimeable number, because it can be changed into a prime (13923719) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20574 + ... + 21239.

It is an arithmetic number, because the mean of its divisors is an integer number (1721343).

Almost surely, 2^13923729 is an apocalyptic number.

It is an amenable number.

13923729 is a deficient number, since it is larger than the sum of its proper divisors (6732387).

13923729 is a wasteful number, since it uses less digits than its factorization.

13923729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41856 (or 41853 counting only the distinct ones).

The product of its digits is 20412, while the sum is 36.

The square root of 13923729 is about 3731.4513262268. The cubic root of 13923729 is about 240.5757530970.

The spelling of 13923729 in words is "thirteen million, nine hundred twenty-three thousand, seven hundred twenty-nine".