42930809 has 2 divisors, whose sum is σ = 42930810. Its totient is φ = 42930808.

The previous prime is 42930803. The next prime is 42930827. The reversal of 42930809 is 90803924.

42930809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42863209 + 67600 = 6547^2 + 260^2 .

It is a cyclic number.

It is not a de Polignac number, because 42930809 - 2⁴ = 42930793 is a prime.

It is a super-2 number, since 2×42930809² = 3686108722788962, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42930803) 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 as a sum of consecutive naturals, namely, 21465404 + 21465405.

It is an arithmetic number, because the mean of its divisors is an integer number (21465405).

Almost surely, 2^42930809 is an apocalyptic number.

It is an amenable number.

42930809 is a deficient number, since it is larger than the sum of its proper divisors (1).

42930809 is an equidigital number, since it uses as much as digits as its factorization.

42930809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 42930809 is about 6552.1606360040. The cubic root of 42930809 is about 350.1517953812.

The spelling of 42930809 in words is "forty-two million, nine hundred thirty thousand, eight hundred nine".