13991944 has 8 divisors (see below), whose sum is σ = 26234910. Its totient is φ = 6995968.

The previous prime is 13991933. The next prime is 13991953. The reversal of 13991944 is 44919931.

It can be written as a sum of positive squares in only one way, i.e., 13235044 + 756900 = 3638^2 + 870^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 13991897 and 13991906.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 874489 + ... + 874504.

Almost surely, 2^13991944 is an apocalyptic number.

It is an amenable number.

13991944 is a deficient number, since it is larger than the sum of its proper divisors (12242966).

13991944 is a wasteful number, since it uses less digits than its factorization.

13991944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1748999 (or 1748995 counting only the distinct ones).

The product of its digits is 34992, while the sum is 40.

The square root of 13991944 is about 3740.5807035807. The cubic root of 13991944 is about 240.9679887236.

The spelling of 13991944 in words is "thirteen million, nine hundred ninety-one thousand, nine hundred forty-four".