42409889 has 2 divisors, whose sum is σ = 42409890. Its totient is φ = 42409888.

The previous prime is 42409859. The next prime is 42409897. The reversal of 42409889 is 98890424.

It is a happy number.

42409889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42315025 + 94864 = 6505^2 + 308^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42409889 is a prime.

It is not a weakly prime, because it can be changed into another prime (42409819) 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, 21204944 + 21204945.

It is an arithmetic number, because the mean of its divisors is an integer number (21204945).

Almost surely, 2^42409889 is an apocalyptic number.

It is an amenable number.

42409889 is a deficient number, since it is larger than the sum of its proper divisors (1).

42409889 is an equidigital number, since it uses as much as digits as its factorization.

42409889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 42409889 is about 6512.2875397206. The cubic root of 42409889 is about 348.7297875860.

The spelling of 42409889 in words is "forty-two million, four hundred nine thousand, eight hundred eighty-nine".