13728897 has 24 divisors (see below), whose sum is σ = 24408384. Its totient is φ = 7241184.

The previous prime is 13728893. The next prime is 13728899. The reversal of 13728897 is 79882731.

It is not a de Polignac number, because 13728897 - 2² = 13728893 is a prime.

It is a super-2 number, since 2×13728897² = 376965225673218, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13728893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7563 + ... + 9200.

It is an arithmetic number, because the mean of its divisors is an integer number (1017016).

Almost surely, 2^13728897 is an apocalyptic number.

It is an amenable number.

13728897 is a deficient number, since it is larger than the sum of its proper divisors (10679487).

13728897 is a wasteful number, since it uses less digits than its factorization.

13728897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16789 (or 16786 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 13728897 is about 3705.2526229665. The cubic root of 13728897 is about 239.4483684825.

The spelling of 13728897 in words is "thirteen million, seven hundred twenty-eight thousand, eight hundred ninety-seven".