342989809 has 2 divisors, whose sum is σ = 342989810. Its totient is φ = 342989808.

The previous prime is 342989791. The next prime is 342989819. The reversal of 342989809 is 908989243.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 313396209 + 29593600 = 17703^2 + 5440^2 .

It is a cyclic number.

It is not a de Polignac number, because 342989809 - 2⁷ = 342989681 is a prime.

It is not a weakly prime, because it can be changed into another prime (342989819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171494904 + 171494905.

It is an arithmetic number, because the mean of its divisors is an integer number (171494905).

Almost surely, 2^342989809 is an apocalyptic number.

It is an amenable number.

342989809 is a deficient number, since it is larger than the sum of its proper divisors (1).

342989809 is an equidigital number, since it uses as much as digits as its factorization.

342989809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1119744, while the sum is 52.

The square root of 342989809 is about 18519.9840442696. The cubic root of 342989809 is about 699.9930672783.

The spelling of 342989809 in words is "three hundred forty-two million, nine hundred eighty-nine thousand, eight hundred nine".