3940683821 has 6 divisors (see below), whose sum is σ = 4076919210. Its totient is φ = 3804471776.

The previous prime is 3940683797. The next prime is 3940683911. The reversal of 3940683821 is 1283860493.

It can be written as a sum of positive squares in 3 ways, for example, as 1429671721 + 2511012100 = 37811^2 + 50110^2 .

It is not a de Polignac number, because 3940683821 - 2¹⁸ = 3940421677 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 (3940683121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 332225 + ... + 343881.

It is an arithmetic number, because the mean of its divisors is an integer number (679486535).

Almost surely, 2^3940683821 is an apocalyptic number.

It is an amenable number.

3940683821 is a deficient number, since it is larger than the sum of its proper divisors (136235389).

3940683821 is an frugal number, since it uses more digits than its factorization.

3940683821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23343 (or 11686 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 3940683821 is about 62774.8661567669. The cubic root of 3940683821 is about 1579.5153965670.

The spelling of 3940683821 in words is "three billion, nine hundred forty million, six hundred eighty-three thousand, eight hundred twenty-one".