13991568 has 20 divisors (see below), whose sum is σ = 36145008. Its totient is φ = 4663840.

The previous prime is 13991563. The next prime is 13991569. The reversal of 13991568 is 86519931.

It is not an unprimeable number, because it can be changed into a prime (13991563) 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 3 ways as a sum of consecutive naturals, for example, 145698 + ... + 145793.

Almost surely, 2^13991568 is an apocalyptic number.

It is an amenable number.

13991568 is an abundant number, since it is smaller than the sum of its proper divisors (22153440).

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

13991568 is a wasteful number, since it uses less digits than its factorization.

13991568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291502 (or 291496 counting only the distinct ones).

The product of its digits is 58320, while the sum is 42.

The square root of 13991568 is about 3740.5304436670. The cubic root of 13991568 is about 240.9658302249.

The spelling of 13991568 in words is "thirteen million, nine hundred ninety-one thousand, five hundred sixty-eight".