3647 has 4 divisors (see below), whose sum is σ = 4176. Its totient is φ = 3120.

The previous prime is 3643. The next prime is 3659. The reversal of 3647 is 7463.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7463 = 17 ⋅439.

It is a cyclic number.

It is not a de Polignac number, because 3647 - 2² = 3643 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 3647.

It is not an unprimeable number, because it can be changed into a prime (3643) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254 + ... + 267.

It is an arithmetic number, because the mean of its divisors is an integer number (1044).

3647 is a deficient number, since it is larger than the sum of its proper divisors (529).

3647 is an equidigital number, since it uses as much as digits as its factorization.

3647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528.

The product of its digits is 504, while the sum is 20.

The square root of 3647 is about 60.3903965875. The cubic root of 3647 is about 15.3925977806.

The spelling of 3647 in words is "three thousand, six hundred forty-seven".