409666693 has 2 divisors, whose sum is σ = 409666694. Its totient is φ = 409666692.

The previous prime is 409666687. The next prime is 409666703. The reversal of 409666693 is 396666904.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212488929 + 197177764 = 14577^2 + 14042^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-409666693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (409666603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204833346 + 204833347.

It is an arithmetic number, because the mean of its divisors is an integer number (204833347).

Almost surely, 2^409666693 is an apocalyptic number.

It is an amenable number.

409666693 is a deficient number, since it is larger than the sum of its proper divisors (1).

409666693 is an equidigital number, since it uses as much as digits as its factorization.

409666693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1259712, while the sum is 49.

The square root of 409666693 is about 20240.2246282002. The cubic root of 409666693 is about 742.6945186755.

The spelling of 409666693 in words is "four hundred nine million, six hundred sixty-six thousand, six hundred ninety-three".