3994503221 has 4 divisors (see below), whose sum is σ = 4024995744. Its totient is φ = 3964010700.

The previous prime is 3994503203. The next prime is 3994503229. The reversal of 3994503221 is 1223054993.

It is a happy number.

3994503221 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.

It is a cyclic number.

It is not a de Polignac number, because 3994503221 - 2⁶ = 3994503157 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 (3994503229) 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, 15246065 + ... + 15246326.

It is an arithmetic number, because the mean of its divisors is an integer number (1006248936).

Almost surely, 2^3994503221 is an apocalyptic number.

It is an amenable number.

3994503221 is a deficient number, since it is larger than the sum of its proper divisors (30492523).

3994503221 is a wasteful number, since it uses less digits than its factorization.

3994503221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30492522.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 3994503221 is about 63202.0824103130. The cubic root of 3994503221 is about 1586.6735859091.

The spelling of 3994503221 in words is "three billion, nine hundred ninety-four million, five hundred three thousand, two hundred twenty-one".