3669 has 4 divisors (see below), whose sum is σ = 4896. Its totient is φ = 2444.

The previous prime is 3659. The next prime is 3671. The reversal of 3669 is 9663.

It can be divided in two parts, 36 and 69, that added together give a triangular number (105 = T_{14}).

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, and also an emirpimes, since its reverse is a distinct semiprime: 9663 = 3 ⋅3221.

It is a cyclic number.

It is not a de Polignac number, because 3669 - 2^{5} = 3637 is a prime.

It is a super-2 number, since 2×3669^{2} = 26923122, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

3669 is a lucky number.

It is a plaindrome in base 10 and base 15.

It is a nialpdrome in base 4 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 609 + ... + 614.

It is an arithmetic number, because the mean of its divisors is an integer number (1224).

It is an amenable number.

3669 is a deficient number, since it is larger than the sum of its proper divisors (1227).

3669 is a wasteful number, since it uses less digits than its factorization.

3669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1226.

The product of its digits is 972, while the sum is 24.

The square root of 3669 is about 60.5722708836. The cubic root of 3669 is about 15.4234869587.

The spelling of 3669 in words is "three thousand, six hundred sixty-nine".

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