3989321 has 4 divisors (see below), whose sum is σ = 4559232. Its totient is φ = 3419412.

The previous prime is 3989317. The next prime is 3989329. The reversal of 3989321 is 1239893.

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.

It is a cyclic number.

It is not a de Polignac number, because 3989321 - 2² = 3989317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3989329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 284945 + ... + 284958.

It is an arithmetic number, because the mean of its divisors is an integer number (1139808).

Almost surely, 2^3989321 is an apocalyptic number.

It is an amenable number.

3989321 is a deficient number, since it is larger than the sum of its proper divisors (569911).

3989321 is an equidigital number, since it uses as much as digits as its factorization.

3989321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569910.

The product of its digits is 11664, while the sum is 35.

The square root of 3989321 is about 1997.3284657262. The cubic root of 3989321 is about 158.5987138303.

The spelling of 3989321 in words is "three million, nine hundred eighty-nine thousand, three hundred twenty-one".