3843621 has 6 divisors (see below), whose sum is σ = 5551910. Its totient is φ = 2562408.

The previous prime is 3843617. The next prime is 3843629. The reversal of 3843621 is 1263483.

It is a happy number.

3843621 is a `hidden beast` number, since 38 + 4 + 3 + 621 = 666.

3843621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2117025 + 1726596 = 1455^2 + 1314^2 .

It is not a de Polignac number, because 3843621 - 2² = 3843617 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 (3843629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 213526 + ... + 213543.

Almost surely, 2^3843621 is an apocalyptic number.

It is an amenable number.

3843621 is a deficient number, since it is larger than the sum of its proper divisors (1708289).

3843621 is a wasteful number, since it uses less digits than its factorization.

3843621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427075 (or 427072 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 3843621 is about 1960.5154934353. The cubic root of 3843621 is about 156.6439114881.

It can be divided in two parts, 384 and 3621, that added together give a triangular number (4005 = T₈₉).

The spelling of 3843621 in words is "three million, eight hundred forty-three thousand, six hundred twenty-one".