3863912821 has 4 divisors (see below), whose sum is σ = 3867236352. Its totient is φ = 3860589292.

The previous prime is 3863912809. The next prime is 3863912867. The reversal of 3863912821 is 1282193683.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1282193683 = 181 ⋅7083943.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3863912821 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 (3863912021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1660021 + ... + 1662346.

It is an arithmetic number, because the mean of its divisors is an integer number (966809088).

Almost surely, 2^3863912821 is an apocalyptic number.

It is an amenable number.

3863912821 is a deficient number, since it is larger than the sum of its proper divisors (3323531).

3863912821 is a wasteful number, since it uses less digits than its factorization.

3863912821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3323530.

The product of its digits is 124416, while the sum is 43.

The square root of 3863912821 is about 62160.3798331381. The cubic root of 3863912821 is about 1569.1908715628.

The spelling of 3863912821 in words is "three billion, eight hundred sixty-three million, nine hundred twelve thousand, eight hundred twenty-one".