3982021 has 4 divisors (see below), whose sum is σ = 4008544. Its totient is φ = 3955500.

The previous prime is 3981973. The next prime is 3982031. The reversal of 3982021 is 1202893.

3982021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1202893 = 31 ⋅38803.

It is a cyclic number.

It is not a de Polignac number, because 3982021 - 2¹³ = 3973829 is a prime.

It is the 1996-th Hogben number.

It is a Duffinian number.

3982021 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3982031) by changing a digit.

It is a nontrivial repunit in base 1995.

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 3 ways as a sum of consecutive naturals, for example, 13035 + ... + 13336.

It is an arithmetic number, because the mean of its divisors is an integer number (1002136).

Almost surely, 2^3982021 is an apocalyptic number.

It is an amenable number.

3982021 is a deficient number, since it is larger than the sum of its proper divisors (26523).

3982021 is a wasteful number, since it uses less digits than its factorization.

3982021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26522.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 3982021 is about 1995.5001879228. The cubic root of 3982021 is about 158.5019156094.

The spelling of 3982021 in words is "three million, nine hundred eighty-two thousand, twenty-one".