13978679 has 16 divisors (see below), whose sum is σ = 16679040. Its totient is φ = 11547360.

The previous prime is 13978673. The next prime is 13978681. The reversal of 13978679 is 97687931.

It is a de Polignac number, because none of the positive numbers 2^k-13978679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13978673) 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 15 ways as a sum of consecutive naturals, for example, 8852 + ... + 10310.

It is an arithmetic number, because the mean of its divisors is an integer number (1042440).

Almost surely, 2^13978679 is an apocalyptic number.

13978679 is a deficient number, since it is larger than the sum of its proper divisors (2700361).

13978679 is a wasteful number, since it uses less digits than its factorization.

13978679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550.

The product of its digits is 571536, while the sum is 50.

The square root of 13978679 is about 3738.8071627191. The cubic root of 13978679 is about 240.8918151047.

The spelling of 13978679 in words is "thirteen million, nine hundred seventy-eight thousand, six hundred seventy-nine".