13921656 has 64 divisors (see below), whose sum is σ = 40089600. Its totient is φ = 3946368.

The previous prime is 13921651. The next prime is 13921679. The reversal of 13921656 is 65612931.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13921651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28825 + ... + 29303.

It is an arithmetic number, because the mean of its divisors is an integer number (626400).

Almost surely, 2^13921656 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 13921656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20044800).

13921656 is an abundant number, since it is smaller than the sum of its proper divisors (26167944).

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

13921656 is a wasteful number, since it uses less digits than its factorization.

13921656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668 (or 664 counting only the distinct ones).

The product of its digits is 9720, while the sum is 33.

The square root of 13921656 is about 3731.1735419302. The cubic root of 13921656 is about 240.5638133289.

The spelling of 13921656 in words is "thirteen million, nine hundred twenty-one thousand, six hundred fifty-six".