13667979 has 16 divisors (see below), whose sum is σ = 19833632. Its totient is φ = 8322048.

The previous prime is 13667977. The next prime is 13667981. The reversal of 13667979 is 97976631.

It is an interprime number because it is at equal distance from previous prime (13667977) and next prime (13667981).

It is not a de Polignac number, because 13667979 - 2¹ = 13667977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13667971) 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, 1977 + ... + 5589.

It is an arithmetic number, because the mean of its divisors is an integer number (1239602).

Almost surely, 2^13667979 is an apocalyptic number.

13667979 is a deficient number, since it is larger than the sum of its proper divisors (6165653).

13667979 is a wasteful number, since it uses less digits than its factorization.

13667979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3726.

The product of its digits is 428652, while the sum is 48.

The square root of 13667979 is about 3697.0229915433. The cubic root of 13667979 is about 239.0936824548.

The spelling of 13667979 in words is "thirteen million, six hundred sixty-seven thousand, nine hundred seventy-nine".