3969321 has 4 divisors (see below), whose sum is σ = 5292432. Its totient is φ = 2646212.

The previous prime is 3969307. The next prime is 3969349. The reversal of 3969321 is 1239693.

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 3969321 - 2⁵ = 3969289 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (3969391) 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, 661551 + ... + 661556.

It is an arithmetic number, because the mean of its divisors is an integer number (1323108).

Almost surely, 2^3969321 is an apocalyptic number.

It is an amenable number.

3969321 is a deficient number, since it is larger than the sum of its proper divisors (1323111).

3969321 is a wasteful number, since it uses less digits than its factorization.

3969321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323110.

The product of its digits is 8748, while the sum is 33.

The square root of 3969321 is about 1992.3154870652. The cubic root of 3969321 is about 158.3332309017. Note that the first 3 decimals are identical.

The spelling of 3969321 in words is "three million, nine hundred sixty-nine thousand, three hundred twenty-one".