409666694 has 16 divisors (see below), whose sum is σ = 623344128. Its totient is φ = 201906432.

The previous prime is 409666693. The next prime is 409666703. The reversal of 409666694 is 496666904.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409666693) 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 in 7 ways as a sum of consecutive naturals, for example, 34742 + ... + 45014.

It is an arithmetic number, because the mean of its divisors is an integer number (38959008).

Almost surely, 2^409666694 is an apocalyptic number.

409666694 is a deficient number, since it is larger than the sum of its proper divisors (213677434).

409666694 is a wasteful number, since it uses less digits than its factorization.

409666694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10559.

The product of its (nonzero) digits is 1679616, while the sum is 50.

The square root of 409666694 is about 20240.2246529034. The cubic root of 409666694 is about 742.6945192798.

The spelling of 409666694 in words is "four hundred nine million, six hundred sixty-six thousand, six hundred ninety-four".