3930821837 has 4 divisors (see below), whose sum is σ = 3931796700. Its totient is φ = 3929846976.

The previous prime is 3930821833. The next prime is 3930821863. The reversal of 3930821837 is 7381280393.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7381280393 = 47 ⋅157048519.

It can be written as a sum of positive squares in 2 ways, for example, as 2124656836 + 1806165001 = 46094^2 + 42499^2 .

It is a cyclic number.

It is not a de Polignac number, because 3930821837 - 2² = 3930821833 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 (3930821833) 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, 481358 + ... + 489455.

It is an arithmetic number, because the mean of its divisors is an integer number (982949175).

Almost surely, 2^3930821837 is an apocalyptic number.

It is an amenable number.

3930821837 is a deficient number, since it is larger than the sum of its proper divisors (974863).

3930821837 is an equidigital number, since it uses as much as digits as its factorization.

3930821837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974862.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 3930821837 is about 62696.2665315886. The cubic root of 3930821837 is about 1578.1966602872.

The spelling of 3930821837 in words is "three billion, nine hundred thirty million, eight hundred twenty-one thousand, eight hundred thirty-seven".