3783869721 has 20 divisors (see below), whose sum is σ = 5654500852. Its totient is φ = 2521663488.

The previous prime is 3783869701. The next prime is 3783869729. The reversal of 3783869721 is 1279683873.

It can be written as a sum of positive squares in 2 ways, for example, as 765905625 + 3017964096 = 27675^2 + 54936^2 .

It is not a de Polignac number, because 3783869721 - 2¹¹ = 3783867673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3783869729) 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 19 ways as a sum of consecutive naturals, for example, 273261 + ... + 286773.

Almost surely, 2^3783869721 is an apocalyptic number.

It is an amenable number.

3783869721 is a deficient number, since it is larger than the sum of its proper divisors (1870631131).

3783869721 is a wasteful number, since it uses less digits than its factorization.

3783869721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16982 (or 16973 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The square root of 3783869721 is about 61513.1670538918. The cubic root of 3783869721 is about 1558.2796234271.

The spelling of 3783869721 in words is "three billion, seven hundred eighty-three million, eight hundred sixty-nine thousand, seven hundred twenty-one".