13665397 has 4 divisors (see below), whose sum is σ = 13741920. Its totient is φ = 13588876.

The previous prime is 13665383. The next prime is 13665413. The reversal of 13665397 is 79356631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13665397 - 2⁷ = 13665269 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13665307) 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, 37993 + ... + 38350.

It is an arithmetic number, because the mean of its divisors is an integer number (3435480).

Almost surely, 2^13665397 is an apocalyptic number.

It is an amenable number.

13665397 is a deficient number, since it is larger than the sum of its proper divisors (76523).

13665397 is an equidigital number, since it uses as much as digits as its factorization.

13665397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76522.

The product of its digits is 102060, while the sum is 40.

The square root of 13665397 is about 3696.6737751660. The cubic root of 13665397 is about 239.0786258819.

The spelling of 13665397 in words is "thirteen million, six hundred sixty-five thousand, three hundred ninety-seven".