409879321 has 4 divisors (see below), whose sum is σ = 409922100. Its totient is φ = 409836544.

The previous prime is 409879319. The next prime is 409879331. The reversal of 409879321 is 123978904.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 235929600 + 173949721 = 15360^2 + 13189^2 .

It is a cyclic number.

It is not a de Polignac number, because 409879321 - 2¹ = 409879319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (409879331) 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 3 ways as a sum of consecutive naturals, for example, 345 + ... + 28633.

It is an arithmetic number, because the mean of its divisors is an integer number (102480525).

Almost surely, 2^409879321 is an apocalyptic number.

It is an amenable number.

409879321 is a deficient number, since it is larger than the sum of its proper divisors (42779).

409879321 is a wasteful number, since it uses less digits than its factorization.

409879321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42778.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 409879321 is about 20245.4765565052. The cubic root of 409879321 is about 742.8229892423.

The spelling of 409879321 in words is "four hundred nine million, eight hundred seventy-nine thousand, three hundred twenty-one".