342005809 has 4 divisors (see below), whose sum is σ = 344301300. Its totient is φ = 339710320.

The previous prime is 342005771. The next prime is 342005819. The reversal of 342005809 is 908500243.

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

It can be written as a sum of positive squares in 2 ways, for example, as 151979584 + 190026225 = 12328^2 + 13785^2 .

It is a cyclic number.

It is not a de Polignac number, because 342005809 - 2¹⁵ = 341973041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (342005819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1147522 + ... + 1147819.

It is an arithmetic number, because the mean of its divisors is an integer number (86075325).

Almost surely, 2^342005809 is an apocalyptic number.

It is an amenable number.

342005809 is a deficient number, since it is larger than the sum of its proper divisors (2295491).

342005809 is a wasteful number, since it uses less digits than its factorization.

342005809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2295490.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 342005809 is about 18493.3990656126. The cubic root of 342005809 is about 699.3230250957.

The spelling of 342005809 in words is "three hundred forty-two million, five thousand, eight hundred nine".