3909947687 has 2 divisors, whose sum is σ = 3909947688. Its totient is φ = 3909947686.

The previous prime is 3909947677. The next prime is 3909947753. The reversal of 3909947687 is 7867499093.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3909947687 - 2¹² = 3909943591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3909947627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1954973843 + 1954973844.

It is an arithmetic number, because the mean of its divisors is an integer number (1954973844).

Almost surely, 2^3909947687 is an apocalyptic number.

3909947687 is a deficient number, since it is larger than the sum of its proper divisors (1).

3909947687 is an equidigital number, since it uses as much as digits as its factorization.

3909947687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20575296, while the sum is 62.

The square root of 3909947687 is about 62529.5744987922. The cubic root of 3909947687 is about 1575.3980936425.

The spelling of 3909947687 in words is "three billion, nine hundred nine million, nine hundred forty-seven thousand, six hundred eighty-seven".