409108685 has 8 divisors (see below), whose sum is σ = 492007416. Its totient is φ = 326568960.

The previous prime is 409108673. The next prime is 409108697. The reversal of 409108685 is 586801904.

It is an interprime number because it is at equal distance from previous prime (409108673) and next prime (409108697).

It can be written as a sum of positive squares in 4 ways, for example, as 73376356 + 335732329 = 8566^2 + 18323^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 409108685 - 2⁴ = 409108669 is a prime.

It is a super-2 number, since 2×409108685² = 334739832284858450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 87236 + ... + 91805.

It is an arithmetic number, because the mean of its divisors is an integer number (61500927).

Almost surely, 2^409108685 is an apocalyptic number.

It is an amenable number.

409108685 is a deficient number, since it is larger than the sum of its proper divisors (82898731).

409108685 is a wasteful number, since it uses less digits than its factorization.

409108685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179503.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 409108685 is about 20226.4353013575. The cubic root of 409108685 is about 742.3571567845.

The spelling of 409108685 in words is "four hundred nine million, one hundred eight thousand, six hundred eighty-five".