409205023 has 4 divisors (see below), whose sum is σ = 414135288. Its totient is φ = 404274760.

The previous prime is 409205009. The next prime is 409205057. The reversal of 409205023 is 320502904.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 409205023 - 2¹³ = 409196831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409205003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2465008 + ... + 2465173.

It is an arithmetic number, because the mean of its divisors is an integer number (103533822).

Almost surely, 2^409205023 is an apocalyptic number.

409205023 is a deficient number, since it is larger than the sum of its proper divisors (4930265).

409205023 is an equidigital number, since it uses as much as digits as its factorization.

409205023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4930264.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 409205023 is about 20228.8166485338. The cubic root of 409205023 is about 742.4154229563.

Adding to 409205023 its reverse (320502904), we get a palindrome (729707927).

The spelling of 409205023 in words is "four hundred nine million, two hundred five thousand, twenty-three".