3984021 has 12 divisors (see below), whose sum is σ = 5841472. Its totient is φ = 2615976.

The previous prime is 3983999. The next prime is 3984031. The reversal of 3984021 is 1204893.

It is not a de Polignac number, because 3984021 - 2⁵ = 3983989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3984031) 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, 2701 + ... + 3906.

Almost surely, 2^3984021 is an apocalyptic number.

It is an amenable number.

3984021 is a deficient number, since it is larger than the sum of its proper divisors (1857451).

3984021 is a wasteful number, since it uses less digits than its factorization.

3984021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6680 (or 6677 counting only the distinct ones).

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

The square root of 3984021 is about 1996.0012525046. The cubic root of 3984021 is about 158.5284474278.

The spelling of 3984021 in words is "three million, nine hundred eighty-four thousand, twenty-one".