13909728 has 72 divisors (see below), whose sum is σ = 42488712. Its totient is φ = 3972864.

The previous prime is 13909717. The next prime is 13909741. The reversal of 13909728 is 82790931.

13909728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3226 + ... + 6182.

It is an arithmetic number, because the mean of its divisors is an integer number (590121).

Almost surely, 2^13909728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13909728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21244356).

13909728 is an abundant number, since it is smaller than the sum of its proper divisors (28578984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13909728 is a wasteful number, since it uses less digits than its factorization.

13909728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2984 (or 2969 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 13909728 is about 3729.5747746895. The cubic root of 13909728 is about 240.4950891038.

The spelling of 13909728 in words is "thirteen million, nine hundred nine thousand, seven hundred twenty-eight".