3993948921 has 8 divisors (see below), whose sum is σ = 5325699744. Its totient is φ = 2662415360.

The previous prime is 3993948913. The next prime is 3993948923. The reversal of 3993948921 is 1298493993.

3993948921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 3993948921 - 2³ = 3993948913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3993948923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5031 + ... + 89516.

It is an arithmetic number, because the mean of its divisors is an integer number (665712468).

Almost surely, 2^3993948921 is an apocalyptic number.

It is an amenable number.

3993948921 is a deficient number, since it is larger than the sum of its proper divisors (1331750823).

3993948921 is a wasteful number, since it uses less digits than its factorization.

3993948921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108631.

The product of its digits is 3779136, while the sum is 57.

The square root of 3993948921 is about 63197.6971178539. The cubic root of 3993948921 is about 1586.6001905619.

The spelling of 3993948921 in words is "three billion, nine hundred ninety-three million, nine hundred forty-eight thousand, nine hundred twenty-one".