409666687 has 2 divisors, whose sum is σ = 409666688. Its totient is φ = 409666686.

The previous prime is 409666651. The next prime is 409666693. The reversal of 409666687 is 786666904.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-409666687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (409666637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204833343 + 204833344.

It is an arithmetic number, because the mean of its divisors is an integer number (204833344).

Almost surely, 2^409666687 is an apocalyptic number.

409666687 is a deficient number, since it is larger than the sum of its proper divisors (1).

409666687 is an equidigital number, since it uses as much as digits as its factorization.

409666687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2612736, while the sum is 52.

The square root of 409666687 is about 20240.2244799805. The cubic root of 409666687 is about 742.6945150496.

The spelling of 409666687 in words is "four hundred nine million, six hundred sixty-six thousand, six hundred eighty-seven".