409666904 has 16 divisors (see below), whose sum is σ = 808553400. Its totient is φ = 194052672.

The previous prime is 409666897. The next prime is 409666909.

It is a happy number.

409666904 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409666909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1347437 + ... + 1347740.

Almost surely, 2^409666904 is an apocalyptic number.

It is an amenable number.

409666904 is a deficient number, since it is larger than the sum of its proper divisors (398886496).

409666904 is a wasteful number, since it uses less digits than its factorization.

409666904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2695202 (or 2695198 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 409666904 is about 20240.2298405922. The cubic root of 409666904 is about 742.6946461844.

The spelling of 409666904 in words is "four hundred nine million, six hundred sixty-six thousand, nine hundred four".