3816621 has 12 divisors (see below), whose sum is σ = 5543200. Its totient is φ = 2530440.

The previous prime is 3816601. The next prime is 3816623. The reversal of 3816621 is 1266183.

3816621 is a `hidden beast` number, since 38 + 1 + 6 + 621 = 666.

It is not a de Polignac number, because 3816621 - 2⁶ = 3816557 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 (3816623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 726 + ... + 2856.

Almost surely, 2^3816621 is an apocalyptic number.

It is an amenable number.

3816621 is a deficient number, since it is larger than the sum of its proper divisors (1726579).

3816621 is a wasteful number, since it uses less digits than its factorization.

3816621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2336 (or 2333 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 3816621 is about 1953.6174139273. The cubic root of 3816621 is about 156.2762609727.

The spelling of 3816621 in words is "three million, eight hundred sixteen thousand, six hundred twenty-one".