13281904 has 20 divisors (see below), whose sum is σ = 25991640. Its totient is φ = 6574400.

The previous prime is 13281901. The next prime is 13281911. The reversal of 13281904 is 40918231.

It is a happy number.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13281901) 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 3 ways as a sum of consecutive naturals, for example, 2494 + ... + 5725.

It is an arithmetic number, because the mean of its divisors is an integer number (1299582).

Almost surely, 2^13281904 is an apocalyptic number.

It is an amenable number.

13281904 is a deficient number, since it is larger than the sum of its proper divisors (12709736).

13281904 is a wasteful number, since it uses less digits than its factorization.

13281904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8328 (or 8322 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 13281904 is about 3644.4346612335. The cubic root of 13281904 is about 236.8209463757.

The spelling of 13281904 in words is "thirteen million, two hundred eighty-one thousand, nine hundred four".