13998665 has 4 divisors (see below), whose sum is σ = 16798404. Its totient is φ = 11198928.

The previous prime is 13998659. The next prime is 13998679. The reversal of 13998665 is 56689931.

13998665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1692601 + 12306064 = 1301^2 + 3508^2 .

It is a cyclic number.

It is not a de Polignac number, because 13998665 - 2⁶ = 13998601 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1399862 + ... + 1399871.

It is an arithmetic number, because the mean of its divisors is an integer number (4199601).

Almost surely, 2^13998665 is an apocalyptic number.

It is an amenable number.

13998665 is a deficient number, since it is larger than the sum of its proper divisors (2799739).

13998665 is an equidigital number, since it uses as much as digits as its factorization.

13998665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2799738.

The product of its digits is 349920, while the sum is 47.

The square root of 13998665 is about 3741.4789856419. The cubic root of 13998665 is about 241.0065653647.

The spelling of 13998665 in words is "thirteen million, nine hundred ninety-eight thousand, six hundred sixty-five".