3984421 has 8 divisors (see below), whose sum is σ = 4665024. Its totient is φ = 3331680.

The previous prime is 3984403. The next prime is 3984439. The reversal of 3984421 is 1244893.

3984421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (3984403) and next prime (3984439).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3984421 - 2⁵ = 3984389 is a prime.

It is a super-2 number, since 2×3984421² = 31751221410482, which contains 22 as substring.

3984421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3984521) 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 7 ways as a sum of consecutive naturals, for example, 6655 + ... + 7228.

It is an arithmetic number, because the mean of its divisors is an integer number (583128).

Almost surely, 2^3984421 is an apocalyptic number.

It is an amenable number.

3984421 is a deficient number, since it is larger than the sum of its proper divisors (680603).

3984421 is a wasteful number, since it uses less digits than its factorization.

3984421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13931.

The product of its digits is 6912, while the sum is 31.

The square root of 3984421 is about 1996.1014503276. The cubic root of 3984421 is about 158.5337527258.

The spelling of 3984421 in words is "three million, nine hundred eighty-four thousand, four hundred twenty-one".