342942809 has 4 divisors (see below), whose sum is σ = 374119440. Its totient is φ = 311766180.

The previous prime is 342942781. The next prime is 342942823. The reversal of 342942809 is 908249243.

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, and also an emirpimes, since its reverse is a distinct semiprime: 908249243 = 11 ⋅82568113.

It is a de Polignac number, because none of the positive numbers 2^k-342942809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (342942829) 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, 15588299 + ... + 15588320.

It is an arithmetic number, because the mean of its divisors is an integer number (93529860).

Almost surely, 2^342942809 is an apocalyptic number.

It is an amenable number.

342942809 is a deficient number, since it is larger than the sum of its proper divisors (31176631).

342942809 is a wasteful number, since it uses less digits than its factorization.

342942809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31176630.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 342942809 is about 18518.7151012159. The cubic root of 342942809 is about 699.9610923953.

The spelling of 342942809 in words is "three hundred forty-two million, nine hundred forty-two thousand, eight hundred nine".