409090909 has 4 divisors (see below), whose sum is σ = 409270240. Its totient is φ = 408911580.

The previous prime is 409090879. The next prime is 409090931. The reversal of 409090909 is 909090904.

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 409090909 - 2¹⁵ = 409058141 is a prime.

It is a Duffinian number.

409090909 is a modest number, since divided by 90909 gives 409 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409090999) 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, 86199 + ... + 90820.

It is an arithmetic number, because the mean of its divisors is an integer number (102317560).

Almost surely, 2^409090909 is an apocalyptic number.

It is an amenable number.

409090909 is a deficient number, since it is larger than the sum of its proper divisors (179331).

409090909 is a wasteful number, since it uses less digits than its factorization.

409090909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179330.

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 409090909 is about 20225.9958716499. The cubic root of 409090909 is about 742.3464046849.

The spelling of 409090909 in words is "four hundred nine million, ninety thousand, nine hundred nine".