409309042 has 8 divisors (see below), whose sum is σ = 620862300. Its totient is φ = 202354944.

The previous prime is 409309031. The next prime is 409309049. The reversal of 409309042 is 240903904.

It can be written as a sum of positive squares in 2 ways, for example, as 401641681 + 7667361 = 20041^2 + 2769^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 409308995 and 409309013.

It is not an unprimeable number, because it can be changed into a prime (409309049) 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, 1149567 + ... + 1149922.

Almost surely, 2^409309042 is an apocalyptic number.

409309042 is a deficient number, since it is larger than the sum of its proper divisors (211553258).

409309042 is a wasteful number, since it uses less digits than its factorization.

409309042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2299580.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 409309042 is about 20231.3875450993. The cubic root of 409309042 is about 742.4783244059.

The spelling of 409309042 in words is "four hundred nine million, three hundred nine thousand, forty-two".