409840656 has 20 divisors (see below), whose sum is σ = 1058755152. Its totient is φ = 136613536.

The previous prime is 409840619. The next prime is 409840663. The reversal of 409840656 is 656048904.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4269126 + ... + 4269221.

Almost surely, 2^409840656 is an apocalyptic number.

It is an amenable number.

409840656 is an abundant number, since it is smaller than the sum of its proper divisors (648914496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

409840656 is a wasteful number, since it uses less digits than its factorization.

409840656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8538358 (or 8538352 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The square root of 409840656 is about 20244.5216293199. The cubic root of 409840656 is about 742.7996310223.

The spelling of 409840656 in words is "four hundred nine million, eight hundred forty thousand, six hundred fifty-six".