13665679 has 8 divisors (see below), whose sum is σ = 13979952. Its totient is φ = 13353600.

The previous prime is 13665677. The next prime is 13665697. The reversal of 13665679 is 97656631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13665679 - 2¹ = 13665677 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 (13665677) 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, 20932 + ... + 21574.

It is an arithmetic number, because the mean of its divisors is an integer number (1747494).

Almost surely, 2^13665679 is an apocalyptic number.

13665679 is a deficient number, since it is larger than the sum of its proper divisors (314273).

13665679 is an equidigital number, since it uses as much as digits as its factorization.

13665679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1097.

The product of its digits is 204120, while the sum is 43.

The square root of 13665679 is about 3696.7119173666. The cubic root of 13665679 is about 239.0802704178.

The spelling of 13665679 in words is "thirteen million, six hundred sixty-five thousand, six hundred seventy-nine".