404106209 has 12 divisors (see below), whose sum is σ = 448262892. Its totient is φ = 363916800.

The previous prime is 404106203. The next prime is 404106259. The reversal of 404106209 is 902601404.

It can be written as a sum of positive squares in 6 ways, for example, as 289680400 + 114425809 = 17020^2 + 10697^2 .

It is a de Polignac number, because none of the positive numbers 2^k-404106209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404106203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22232 + ... + 36089.

It is an arithmetic number, because the mean of its divisors is an integer number (37355241).

Almost surely, 2^404106209 is an apocalyptic number.

It is an amenable number.

404106209 is a deficient number, since it is larger than the sum of its proper divisors (44156683).

404106209 is a wasteful number, since it uses less digits than its factorization.

404106209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58388 (or 58375 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 404106209 is about 20102.3931162436. The cubic root of 404106209 is about 739.3189552173.

The spelling of 404106209 in words is "four hundred four million, one hundred six thousand, two hundred nine".