409020409 has 4 divisors (see below), whose sum is σ = 467451904. Its totient is φ = 350588916.

The previous prime is 409020397. The next prime is 409020413. The reversal of 409020409 is 904020904.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 409020409 - 2⁵ = 409020377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (409020419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29215737 + ... + 29215750.

It is an arithmetic number, because the mean of its divisors is an integer number (116862976).

Almost surely, 2^409020409 is an apocalyptic number.

It is an amenable number.

409020409 is a deficient number, since it is larger than the sum of its proper divisors (58431495).

409020409 is an equidigital number, since it uses as much as digits as its factorization.

409020409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58431494.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 409020409 is about 20224.2529899129. The cubic root of 409020409 is about 742.3037585583.

The spelling of 409020409 in words is "four hundred nine million, twenty thousand, four hundred nine".