409826985 has 32 divisors (see below), whose sum is σ = 696695040. Its totient is φ = 205325568.

The previous prime is 409826971. The next prime is 409826987. The reversal of 409826985 is 589628904.

It is not a de Polignac number, because 409826985 - 2⁴ = 409826969 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (409826987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3364 + ... + 28826.

It is an arithmetic number, because the mean of its divisors is an integer number (21771720).

Almost surely, 2^409826985 is an apocalyptic number.

It is an amenable number.

409826985 is a deficient number, since it is larger than the sum of its proper divisors (286868055).

409826985 is a wasteful number, since it uses less digits than its factorization.

409826985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25537.

The product of its (nonzero) digits is 1244160, while the sum is 51.

The square root of 409826985 is about 20244.1839796026. The cubic root of 409826985 is about 742.7913717745.

The spelling of 409826985 in words is "four hundred nine million, eight hundred twenty-six thousand, nine hundred eighty-five".