3921388965 has 144 divisors (see below), whose sum is σ = 7646296320. Its totient is φ = 1857323520.

The previous prime is 3921388943. The next prime is 3921388969. The reversal of 3921388965 is 5698831293.

It is not a de Polignac number, because 3921388965 - 2¹⁹ = 3920864677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3921388969) 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 143 ways as a sum of consecutive naturals, for example, 36648442 + ... + 36648548.

It is an arithmetic number, because the mean of its divisors is an integer number (53099280).

Almost surely, 2^3921388965 is an apocalyptic number.

It is an amenable number.

3921388965 is a deficient number, since it is larger than the sum of its proper divisors (3724907355).

3921388965 is a wasteful number, since it uses less digits than its factorization.

3921388965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284 (or 268 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The square root of 3921388965 is about 62620.9946024494. The cubic root of 3921388965 is about 1576.9332390690.

The spelling of 3921388965 in words is "three billion, nine hundred twenty-one million, three hundred eighty-eight thousand, nine hundred sixty-five".