3994871977 has 2 divisors, whose sum is σ = 3994871978. Its totient is φ = 3994871976.

The previous prime is 3994871927. The next prime is 3994872017. The reversal of 3994871977 is 7791784993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3454030441 + 540841536 = 58771^2 + 23256^2 .

It is a cyclic number.

It is not a de Polignac number, because 3994871977 - 2¹⁹ = 3994347689 is a prime.

It is a super-2 number, since 2×3994871977² = 31918004225239777058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3994871927) 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 as a sum of consecutive naturals, namely, 1997435988 + 1997435989.

It is an arithmetic number, because the mean of its divisors is an integer number (1997435989).

Almost surely, 2^3994871977 is an apocalyptic number.

It is an amenable number.

3994871977 is a deficient number, since it is larger than the sum of its proper divisors (1).

3994871977 is an equidigital number, since it uses as much as digits as its factorization.

3994871977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24004512, while the sum is 64.

The square root of 3994871977 is about 63204.9996202832. Note that the first 3 decimals coincide. The cubic root of 3994871977 is about 1586.7224094523.

The spelling of 3994871977 in words is "three billion, nine hundred ninety-four million, eight hundred seventy-one thousand, nine hundred seventy-seven".