13668997 has 4 divisors (see below), whose sum is σ = 13677580. Its totient is φ = 13660416.

The previous prime is 13668989. The next prime is 13669001. The reversal of 13668997 is 79986631.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 79986631 = 79 ⋅1012489.

It can be written as a sum of positive squares in 2 ways, for example, as 229441 + 13439556 = 479^2 + 3666^2 .

It is a cyclic number.

It is not a de Polignac number, because 13668997 - 2³ = 13668989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13668997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13668917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1122 + ... + 5347.

It is an arithmetic number, because the mean of its divisors is an integer number (3419395).

Almost surely, 2^13668997 is an apocalyptic number.

It is an amenable number.

13668997 is a deficient number, since it is larger than the sum of its proper divisors (8583).

13668997 is an equidigital number, since it uses as much as digits as its factorization.

13668997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8582.

The product of its digits is 489888, while the sum is 49.

The square root of 13668997 is about 3697.1606673230. The cubic root of 13668997 is about 239.0996182586.

The spelling of 13668997 in words is "thirteen million, six hundred sixty-eight thousand, nine hundred ninety-seven".