3943961687 has 2 divisors, whose sum is σ = 3943961688. Its totient is φ = 3943961686.

The previous prime is 3943961669. The next prime is 3943961711. The reversal of 3943961687 is 7861693493.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3943961687 - 2²² = 3939767383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3943961627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1971980843 + 1971980844.

It is an arithmetic number, because the mean of its divisors is an integer number (1971980844).

Almost surely, 2^3943961687 is an apocalyptic number.

3943961687 is a deficient number, since it is larger than the sum of its proper divisors (1).

3943961687 is an equidigital number, since it uses as much as digits as its factorization.

3943961687 is an odious number, because the sum of its binary digits is odd.

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

The square root of 3943961687 is about 62800.9688380681. The cubic root of 3943961687 is about 1579.9532228580.

The spelling of 3943961687 in words is "three billion, nine hundred forty-three million, nine hundred sixty-one thousand, six hundred eighty-seven".