3928020321 has 8 divisors (see below), whose sum is σ = 5275039840. Its totient is φ = 2599840512.

The previous prime is 3928020301. The next prime is 3928020353. The reversal of 3928020321 is 1230208293.

It is a happy number.

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

It is not a de Polignac number, because 3928020321 - 2¹¹ = 3928018273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3928020301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4709440 + ... + 4710273.

It is an arithmetic number, because the mean of its divisors is an integer number (659379980).

Almost surely, 2^3928020321 is an apocalyptic number.

It is an amenable number.

3928020321 is a deficient number, since it is larger than the sum of its proper divisors (1347019519).

3928020321 is a wasteful number, since it uses less digits than its factorization.

3928020321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9419855.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 3928020321 is about 62673.9205810519. The cubic root of 3928020321 is about 1577.8216416808.

The spelling of 3928020321 in words is "three billion, nine hundred twenty-eight million, twenty thousand, three hundred twenty-one".