13720044 has 48 divisors (see below), whose sum is σ = 35422688. Its totient is φ = 4105728.

The previous prime is 13720039. The next prime is 13720061. The reversal of 13720044 is 44002731.

It is a self number, because there is not a number n which added to its sum of digits gives 13720044.

It is an unprimeable number.

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, 4584 + ... + 6960.

Almost surely, 2^13720044 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 13720044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17711344).

13720044 is an abundant number, since it is smaller than the sum of its proper divisors (21702644).

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

13720044 is a wasteful number, since it uses less digits than its factorization.

13720044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2434 (or 2432 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 13720044 is about 3704.0577749274. The cubic root of 13720044 is about 239.3968884492.

Adding to 13720044 its reverse (44002731), we get a palindrome (57722775).

The spelling of 13720044 in words is "thirteen million, seven hundred twenty thousand, forty-four".