13987944 has 64 divisors (see below), whose sum is σ = 40128000. Its totient is φ = 4510080.

The previous prime is 13987921. The next prime is 13987949. The reversal of 13987944 is 44978931.

It is a self number, because there is not a number n which added to its sum of digits gives 13987944.

It is not an unprimeable number, because it can be changed into a prime (13987949) 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 15 ways as a sum of consecutive naturals, for example, 5652 + ... + 7740.

It is an arithmetic number, because the mean of its divisors is an integer number (627000).

Almost surely, 2^13987944 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 13987944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20064000).

13987944 is an abundant number, since it is smaller than the sum of its proper divisors (26140056).

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

13987944 is a wasteful number, since it uses less digits than its factorization.

13987944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135 (or 2125 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 13987944 is about 3740.0459890221. The cubic root of 13987944 is about 240.9450239895.

The spelling of 13987944 in words is "thirteen million, nine hundred eighty-seven thousand, nine hundred forty-four".