3973318921 has 8 divisors (see below), whose sum is σ = 4667955264. Its totient is φ = 3334253520.

The previous prime is 3973318907. The next prime is 3973318961. The reversal of 3973318921 is 1298133793.

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

It is not a de Polignac number, because 3973318921 - 2¹¹ = 3973316873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3973318961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13892581 + ... + 13892866.

It is an arithmetic number, because the mean of its divisors is an integer number (583494408).

Almost surely, 2^3973318921 is an apocalyptic number.

It is an amenable number.

3973318921 is a deficient number, since it is larger than the sum of its proper divisors (694636343).

3973318921 is a wasteful number, since it uses less digits than its factorization.

3973318921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27785471.

The product of its digits is 244944, while the sum is 46.

The square root of 3973318921 is about 63034.2678310774. The cubic root of 3973318921 is about 1583.8637108585.

The spelling of 3973318921 in words is "three billion, nine hundred seventy-three million, three hundred eighteen thousand, nine hundred twenty-one".