3921865683 has 4 divisors (see below), whose sum is σ = 5229154248. Its totient is φ = 2614577120.

The previous prime is 3921865681. The next prime is 3921865693. The reversal of 3921865683 is 3865681293.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3921865683 - 2¹ = 3921865681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3921865681) 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 3 ways as a sum of consecutive naturals, for example, 653644278 + ... + 653644283.

It is an arithmetic number, because the mean of its divisors is an integer number (1307288562).

Almost surely, 2^3921865683 is an apocalyptic number.

3921865683 is a deficient number, since it is larger than the sum of its proper divisors (1307288565).

3921865683 is a wasteful number, since it uses less digits than its factorization.

3921865683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1307288564.

The product of its digits is 1866240, while the sum is 51.

The square root of 3921865683 is about 62624.8008619588. The cubic root of 3921865683 is about 1576.9971383664.

The spelling of 3921865683 in words is "three billion, nine hundred twenty-one million, eight hundred sixty-five thousand, six hundred eighty-three".