3994793861 has 2 divisors, whose sum is σ = 3994793862. Its totient is φ = 3994793860.

The previous prime is 3994793851. The next prime is 3994793923. The reversal of 3994793861 is 1683974993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2041684225 + 1953109636 = 45185^2 + 44194^2 .

It is a cyclic number.

It is not a de Polignac number, because 3994793861 - 2³⁰ = 2921052037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3994793861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3994793851) 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 as a sum of consecutive naturals, namely, 1997396930 + 1997396931.

It is an arithmetic number, because the mean of its divisors is an integer number (1997396931).

Almost surely, 2^3994793861 is an apocalyptic number.

It is an amenable number.

3994793861 is a deficient number, since it is larger than the sum of its proper divisors (1).

3994793861 is an equidigital number, since it uses as much as digits as its factorization.

3994793861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8817984, while the sum is 59.

The square root of 3994793861 is about 63204.3816598185. The cubic root of 3994793861 is about 1586.7120670920.

The spelling of 3994793861 in words is "three billion, nine hundred ninety-four million, seven hundred ninety-three thousand, eight hundred sixty-one".