13693657 has 4 divisors (see below), whose sum is σ = 13708980. Its totient is φ = 13678336.

The previous prime is 13693639. The next prime is 13693703. The reversal of 13693657 is 75639631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75639631 = 503 ⋅150377.

It can be written as a sum of positive squares in 2 ways, for example, as 6990736 + 6702921 = 2644^2 + 2589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13693657 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 not an unprimeable number, because it can be changed into a prime (13693607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6232 + ... + 8137.

It is an arithmetic number, because the mean of its divisors is an integer number (3427245).

Almost surely, 2^13693657 is an apocalyptic number.

It is an amenable number.

13693657 is a deficient number, since it is larger than the sum of its proper divisors (15323).

13693657 is an equidigital number, since it uses as much as digits as its factorization.

13693657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15322.

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

The square root of 13693657 is about 3700.4941561905. The cubic root of 13693657 is about 239.2433170341.

The spelling of 13693657 in words is "thirteen million, six hundred ninety-three thousand, six hundred fifty-seven".