3963291821 has 4 divisors (see below), whose sum is σ = 4196426652. Its totient is φ = 3730156992.

The previous prime is 3963291793. The next prime is 3963291847. The reversal of 3963291821 is 1281923693.

3963291821 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.

It can be written as a sum of positive squares in 2 ways, for example, as 1602400900 + 2360890921 = 40030^2 + 48589^2 .

It is a cyclic number.

It is not a de Polignac number, because 3963291821 - 2¹⁰ = 3963290797 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 (3963293821) 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, 116567390 + ... + 116567423.

It is an arithmetic number, because the mean of its divisors is an integer number (1049106663).

Almost surely, 2^3963291821 is an apocalyptic number.

It is an amenable number.

3963291821 is a deficient number, since it is larger than the sum of its proper divisors (233134831).

3963291821 is a wasteful number, since it uses less digits than its factorization.

3963291821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233134830.

The product of its digits is 139968, while the sum is 44.

The square root of 3963291821 is about 62954.6806917484. The cubic root of 3963291821 is about 1582.5302380528.

The spelling of 3963291821 in words is "three billion, nine hundred sixty-three million, two hundred ninety-one thousand, eight hundred twenty-one".