3666621 has 12 divisors (see below), whose sum is σ = 5687232. Its totient is φ = 2095128.

The previous prime is 3666613. The next prime is 3666629. The reversal of 3666621 is 1266663.

It is an interprime number because it is at equal distance from previous prime (3666613) and next prime (3666629).

It is not a de Polignac number, because 3666621 - 2³ = 3666613 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3666629) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12325 + ... + 12618.

It is an arithmetic number, because the mean of its divisors is an integer number (473936).

Almost surely, 2^3666621 is an apocalyptic number.

It is an amenable number.

3666621 is a deficient number, since it is larger than the sum of its proper divisors (2020611).

3666621 is a wasteful number, since it uses less digits than its factorization.

3666621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24960 (or 24953 counting only the distinct ones).

The product of its digits is 7776, while the sum is 30.

The square root of 3666621 is about 1914.8422911561. The cubic root of 3666621 is about 154.2015267975.

It can be divided in two parts, 366662 and 1, that added together give a palindrome (366663).

The spelling of 3666621 in words is "three million, six hundred sixty-six thousand, six hundred twenty-one".