3646 has 4 divisors (see below), whose sum is σ = 5472. Its totient is φ = 1822.

The previous prime is 3643. The next prime is 3659. The reversal of 3646 is 6463.

It is a happy number.

3646 is nontrivially palindromic in base 16.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6463 = 23 ⋅281.

3646 is an undulating number in base 16.

It is a congruent number.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910 + ... + 913.

It is an arithmetic number, because the mean of its divisors is an integer number (1368).

2³⁶⁴⁶ is an apocalyptic number.

3646 is a deficient number, since it is larger than the sum of its proper divisors (1826).

3646 is a wasteful number, since it uses less digits than its factorization.

3646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1825.

The product of its digits is 432, while the sum is 19.

The square root of 3646 is about 60.3821165578. The cubic root of 3646 is about 15.3911907790.

The spelling of 3646 in words is "three thousand, six hundred forty-six".