13665943 has 6 divisors (see below), whose sum is σ = 14517416. Its totient is φ = 12861792.

The previous prime is 13665929. The next prime is 13665961. The reversal of 13665943 is 34956631.

13665943 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-13665943 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 (13665983) 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 5 ways as a sum of consecutive naturals, for example, 23355 + ... + 23932.

Almost surely, 2^13665943 is an apocalyptic number.

13665943 is a deficient number, since it is larger than the sum of its proper divisors (851473).

13665943 is an equidigital number, since it uses as much as digits as its factorization.

13665943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47321 (or 47304 counting only the distinct ones).

The product of its digits is 58320, while the sum is 37.

The square root of 13665943 is about 3696.7476246019. The cubic root of 13665943 is about 239.0818099629.

The spelling of 13665943 in words is "thirteen million, six hundred sixty-five thousand, nine hundred forty-three".