3946021 has 4 divisors (see below), whose sum is σ = 4073344. Its totient is φ = 3818700.

The previous prime is 3945983. The next prime is 3946027. The reversal of 3946021 is 1206493.

3946021 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: 1206493 = 349 ⋅3457.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3946021 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 (3946027) 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 3 ways as a sum of consecutive naturals, for example, 63615 + ... + 63676.

It is an arithmetic number, because the mean of its divisors is an integer number (1018336).

Almost surely, 2^3946021 is an apocalyptic number.

3946021 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3946021 is a deficient number, since it is larger than the sum of its proper divisors (127323).

3946021 is a wasteful number, since it uses less digits than its factorization.

3946021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127322.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 3946021 is about 1986.4594131268. The cubic root of 3946021 is about 158.0228162318.

The spelling of 3946021 in words is "three million, nine hundred forty-six thousand, twenty-one".