3961394687 has 2 divisors, whose sum is σ = 3961394688. Its totient is φ = 3961394686.

The previous prime is 3961394623. The next prime is 3961394707. The reversal of 3961394687 is 7864931693.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3961394687 - 2⁶ = 3961394623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3961394887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1980697343 + 1980697344.

It is an arithmetic number, because the mean of its divisors is an integer number (1980697344).

Almost surely, 2^3961394687 is an apocalyptic number.

3961394687 is a deficient number, since it is larger than the sum of its proper divisors (1).

3961394687 is an equidigital number, since it uses as much as digits as its factorization.

3961394687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5878656, while the sum is 56.

The square root of 3961394687 is about 62939.6114303226. The cubic root of 3961394687 is about 1582.2776911615.

The spelling of 3961394687 in words is "three billion, nine hundred sixty-one million, three hundred ninety-four thousand, six hundred eighty-seven".