13978668 has 24 divisors (see below), whose sum is σ = 35582400. Its totient is φ = 4235920.

The previous prime is 13978649. The next prime is 13978669. The reversal of 13978668 is 86687931.

It is not an unprimeable number, because it can be changed into a prime (13978669) 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 7 ways as a sum of consecutive naturals, for example, 52818 + ... + 53081.

It is an arithmetic number, because the mean of its divisors is an integer number (1482600).

Almost surely, 2^13978668 is an apocalyptic number.

It is an amenable number.

13978668 is an abundant number, since it is smaller than the sum of its proper divisors (21603732).

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

13978668 is a wasteful number, since it uses less digits than its factorization.

13978668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105917 (or 105915 counting only the distinct ones).

The product of its digits is 435456, while the sum is 48.

The square root of 13978668 is about 3738.8056916614. The cubic root of 13978668 is about 240.8917519178.

The spelling of 13978668 in words is "thirteen million, nine hundred seventy-eight thousand, six hundred sixty-eight".