13729928 has 8 divisors (see below), whose sum is σ = 25743630. Its totient is φ = 6864960.

The previous prime is 13729927. The next prime is 13729973. The reversal of 13729928 is 82992731.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 9721924 + 4008004 = 3118^2 + 2002^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13729927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 858113 + ... + 858128.

Almost surely, 2^13729928 is an apocalyptic number.

It is an amenable number.

13729928 is a deficient number, since it is larger than the sum of its proper divisors (12013702).

13729928 is a wasteful number, since it uses less digits than its factorization.

13729928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1716247 (or 1716243 counting only the distinct ones).

The product of its digits is 54432, while the sum is 41.

The square root of 13729928 is about 3705.3917471706. The cubic root of 13729928 is about 239.4543622898.

The spelling of 13729928 in words is "thirteen million, seven hundred twenty-nine thousand, nine hundred twenty-eight".