42887809 has 2 divisors, whose sum is σ = 42887810. Its totient is φ = 42887808.

The previous prime is 42887783. The next prime is 42887827. The reversal of 42887809 is 90878824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23280625 + 19607184 = 4825^2 + 4428^2 .

It is a cyclic number.

It is not a de Polignac number, because 42887809 - 2⁵ = 42887777 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42887869) 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 as a sum of consecutive naturals, namely, 21443904 + 21443905.

It is an arithmetic number, because the mean of its divisors is an integer number (21443905).

Almost surely, 2^42887809 is an apocalyptic number.

It is an amenable number.

42887809 is a deficient number, since it is larger than the sum of its proper divisors (1).

42887809 is an equidigital number, since it uses as much as digits as its factorization.

42887809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 258048, while the sum is 46.

The square root of 42887809 is about 6548.8784535980. The cubic root of 42887809 is about 350.0348509514.

The spelling of 42887809 in words is "forty-two million, eight hundred eighty-seven thousand, eight hundred nine".