3806621 has 16 divisors (see below), whose sum is σ = 4771200. Its totient is φ = 2956608.

The previous prime is 3806617. The next prime is 3806639. The reversal of 3806621 is 1266083.

It is not a de Polignac number, because 3806621 - 2² = 3806617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3806641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5015 + ... + 5723.

It is an arithmetic number, because the mean of its divisors is an integer number (298200).

Almost surely, 2^3806621 is an apocalyptic number.

It is an amenable number.

3806621 is a deficient number, since it is larger than the sum of its proper divisors (964579).

3806621 is a wasteful number, since it uses less digits than its factorization.

3806621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 3806621 is about 1951.0563805283. The cubic root of 3806621 is about 156.1396541439.

The spelling of 3806621 in words is "three million, eight hundred six thousand, six hundred twenty-one".