3866621 has 8 divisors (see below), whose sum is σ = 4234464. Its totient is φ = 3501520.

The previous prime is 3866617. The next prime is 3866623. The reversal of 3866621 is 1266683.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3866621 - 2² = 3866617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3866623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3311 + ... + 4323.

It is an arithmetic number, because the mean of its divisors is an integer number (529308).

Almost surely, 2^3866621 is an apocalyptic number.

It is an amenable number.

3866621 is a deficient number, since it is larger than the sum of its proper divisors (367843).

3866621 is a wasteful number, since it uses less digits than its factorization.

3866621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1371.

The product of its digits is 10368, while the sum is 32.

The square root of 3866621 is about 1966.3725486286. The cubic root of 3866621 is about 156.9557396163.

It can be divided in two parts, 386 and 6621, that added together give a palindrome (7007).

The spelling of 3866621 in words is "three million, eight hundred sixty-six thousand, six hundred twenty-one".